Geometrical Optics
PIRA classification 6A
Grayed Demos are either not available or haven't been built yet. |
6A.01 Speed of Light
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A01.10 |
speed of light |
pira200 |
A circuit generates a rapped light pulse that is sent through a fiber optic wire of (20m & 0.1m). The speed of light is shown on oscilloscope by comparing two difference lengths of fiber to a reference signal. |
6A01.39 |
Speed of Light w/Microwave |
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Microwave with Marshmallows or large chocolate bar |
6A02. Straight Line Propagation
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A02.10 |
light in a vacuum |
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Place a flashing light in the bell jar to emphasize the point. |
6A02.15 |
straight line propagation of light (Shadows) |
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A good point source shows straight line propagation of light by shadow projection. |
6A02.16 |
propagation star |
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An intense radiation point source limited by a star shaped aperture melts a star shaped pattern on a paraffin backed black foil. |
6A02.20 |
propagation of light (studio shapes) |
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Using a studio projector LED lamp and masks one can project all sorts of shapes. One can use a 'smoke in a can' to show the straight line propagation of the projected shapes. |
6A02.35 |
chalk dust |
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chalk dust with a laser beam. |
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6A10. Reflection From Flat Surfaces
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A10.10 |
blackboard optics - plane mirror |
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Blackboard optics - plane mirror. |
6A10.15 |
laser and flat mirror |
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Shine a laser at a flat mirror on the lecture bench and use chalk dust to make the beam visible. |
6A10.20 |
diffuse/specular reflection |
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Show a beam on light reflecting off a mirror on an optics board. Replace the mirror with a sheet of paper. |
6A10.22 |
scattering with aluminum foil |
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Reflect light off a sheet of aluminum foil, then crumple and flatten it to create many facets. |
6A10.25 |
ripple tank reflection |
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6A10.30 |
corner reflector |
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Three reflectors are placed on the inside corner of a box. Look at your image in a corner cube. |
6A10.31 |
large corner cube |
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Use large mirror wall tiles (12 in sq) to make a large corner reflector. Look at your image in a corner cube. |
6A10.32 |
corner cube |
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Precisionly ground quartz corner cube. Use a laser to show that the ligth is refracted back out the say direction as it goes in. |
6A10.35 |
perversion |
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Perversion can be demonstrated in public with a license plate and a plane mirror. Sorry, no inversion. |
6A10.37 |
parity reversal in a mirror |
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View a Cartesian coordinate system in a mirror. |
6A10.40 |
mirrors at an angle |
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A candle placed between angled mirrors forms multiple images. Mirrors angled at 60 degrees give one object and five images arranged in a hexagon. |
6A10.41 |
hinged mirrors |
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Place a light between two mirrors hinged together and standing vertically. Place a sheet of clear glass between the mirrors forming an isosceles triangle. A few more variations are given. |
6A10.42 |
mirrors, kaleidoscopes |
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mirrors are shown at 60 or 30 degrees withing a kaleidoscope.Hand out and show some kaleidoscopes |
6A10.45 |
parallel mirrors |
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An infinite number of images are formed with a candle between parallel images. |
6A10.50 |
height of a mirror for full view |
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Shades are pulled up from the bottom and down from the top covering a mirror until a person can just see their entire height. |
6A10.60 |
candle in a glass of water |
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A candle is placed in front of a sheet of glass and a beaker of water an equal distance behind. Place the entire apparatus on a rotating table. The sheet of glass is between a hidden candle and a glass of water so the image of the candle appears in the glass. (creating a pepper's ghost image) |
6A10.65 |
half silvered mirror box |
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6A10.65 |
Mirror Box |
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Two people look into opposite ends of a box containing a half silvered mirror in the center. As the light on one end is dimmed, the light on the other brightens, causing metamorphosis. |
6A10.80 |
chinese magic mirror |
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The decorative pattern on the back of a bronze mirror is revealed when light is reflected from the polished front side onto a screen. |
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6A20. Reflection from Curved Surfaces
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A20.10 |
blackboard optics - concave mirror |
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Blackboard optics - concave mirror. |
6A20.10 |
blackboard optics - convex mirror |
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Blackboard optics - convex mirror. |
6A20.10 |
concave and convex mirrors |
pira200 |
Shine parallel beams at convex and concave mirrors. Use a thread screen for display. |
6A20.11 |
optical disc with curved mirrors |
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Use the optical disc with multiple beams and curved lens elements. |
6A20.11 |
optical disc - curved mirror |
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Mount either concave or convex mirrors in the optical disc. |
6A20.11 |
large optical disc |
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A large translucent screen and large lens elements scale up the Hartl optical disc. Diagrams. |
6A20.15 |
parallel lasers and curved mirrors |
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Shine parallel lasers at converging and diverging mirrors and use chalk dust to make the beams visible. |
6A20.20 |
spherical abberation in a mirror |
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Shine parallel rays at spherical and parabolic mirror elements, noting the difference in aberration. |
6A20.21 |
off focal point source |
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A picture of the caustic formed by parallel laser rays incident on a parabolic mirror at 30 degrees. |
6A20.24 |
concave mirrors - caustics |
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Directions for making a large cylindrical or parabolic mirror element. |
6A20.26 |
variable curved mirrors |
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Aluminized mylar stretched over a coffee can makes a variable positive or negative mirror when the can is pressurized or evacuated. |
6A20.27 |
elliptical tank |
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A filament lamp is placed at one focus of an elliptically shaped wall of shiny aluminum and chalk dust shows the image at the other focus. |
6A20.28 |
ellipsoidal mirror |
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Compare the light intensity from the lamps at the near and far focus of an ellipsoidal mirror. Directions for making the mirror element. Diagram. |
6A20.30 |
flower in a vase |
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A hidden flower at the center of curvature of a parabolic mirror appears in an empty vase. |
6A20.30 |
lamp in the socket |
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A 40 W lamp is projected onto an empty socket. |
6A20.30 |
mirror and rose |
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Hints for projecting a real image (rose) on an object (vase). |
6A20.31 |
cold candle |
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Hold your finger in the inverted image of a candle burning at the center of curvature of a parabolic mirror. |
6A20.31 |
large concave mirror |
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Hold a candle and other objects at the center of curvature of a large convex mirror. |
6A20.35 |
optic mirage |
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Same as Oc-7. |
6A20.35 |
optic mirage |
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Derivation of additional "magic separations" of the Optic Mirage that give images. |
6A20.35 |
optic mirage |
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Two concave mirrors face each other. Images of objects resting on the bottom mirror appear at the center hole of the top mirror. |
6A20.36 |
shine an light on the Optic Mirage |
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Shine a light on an shiny object in the Optic Mirage and the reflections will look real. |
6A20.37 |
red ball in hemisphere |
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Looking at a red ball pendulum suspended from the rim of a hemispherical concave mirror makes one puke. |
6A20.37 |
swinging lamp and concave mirror |
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A lamp pendulum is swung between the center of curvature and the principle focus on a concave mirror. |
6A20.40 |
projected arrow with mirror |
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A converging mirror is used to project an image of an illuminated arrow onto a screen. |
6A20.40 |
image with a concave mirror |
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A concave mirror is used to image a lamp filament on a screen or the wall. |
6A20.41 |
projected filament with mirror |
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A converging mirror is used to project the image of a light bulb filament onto a screen. Masks can be used to stop down the mirror. |
6A20.42 |
rotating liquid mirror |
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Rotate a pan of glycerine mixed with dark dye, using a lighted object as a source and ground glass screen or TV camera as a detector. |
6A20.45 |
no image with convex mirror |
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Try to project the image of a filament from a convex mirror. |
6A20.45 |
convex and concave mirrors |
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Large 16" convex and concave mirrors are shown. |
6A20.45 |
concave and convex mirror |
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Project a lamp image with a concave mirror, then try convex. |
6A20.50 |
amusement park mirrors |
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Cylindrical mirrors are made with ten inch radius of curvature. |
6A20.51 |
convex mirror |
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View the image of your nose in a 1/2" diameter steel ball through a short focal length lens. |
6A20.60 |
lighting a cigarette |
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Light a cigarette at the focal point of a parabolic mirror concentrating the beam of an arc light. |
6A20.60 |
energy at a focal point |
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Remove the projection head of an overhead projector and hold a piece of paper at the focal point until it bursts into flame. |
6A40. Refractive Index
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A40.10 |
apparent depth with tv camera |
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Focus a camera on a spot and then note how far the camera is moved to refocus when a clear plastic block is placed on the spot. |
6A40.11 |
apparent depth |
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Look down into a tall graduate and estimate the distance to a coin at the bottom. |
6A40.12 |
focusing telescope method |
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Move a telescope back and forth on a optical bench to focus on the front and then on the back of a block of plexiglass or container of liquid. |
6A40.13 |
microwave index of refraction |
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Index of refraction is determined by measuring the distance between minima with a movable plane mirror in a container of liquid. Diagram. |
6A40.15 |
refractive index of ice |
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Freeze water by pumping in a hollow acrylic prism and measure the minimum deviation. |
6A40.20 |
Michelson index of refraction |
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Place a gas cell in one leg of the Michelson interferometer and evacuate air or let in a gas while counting fringes. |
6A40.20 |
Michelson index of refraction |
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Count fringes of laser light as air is let into an evacuated chamber in one leg of a Michelson interferometer. |
6A40.20 |
Michelson index of refraction |
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A vacuum chamber is put in one leg of a Michelson interferometer and fringes are counted as air or a gas is leaked into the chamber. Reference: TPT 6(4),176. |
6A40.21 |
Raleigh refractometer |
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Improvements on the Raleigh refractometer to make the fringes more visible for easier counting as the air is let back in to the tube. |
6A40.25 |
index of refraction of He and SF6 |
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In addition to letting air (21 fringes) into one arm of the Michelson interferometer, let in He (3 fringes) and SF6 (55 fringes). |
6A40.30 |
Cheshire cat |
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6A40.30 |
disappearing beaker |
pira200 |
Place a small beaker in a liquid with an index of refraction matched to the glass (johnsons baby oil or wesson oil). |
6A40.31 |
more Christiansen filters |
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A table of Christiansen filter pairs. See AJP 25,440 (1957) |
6A40.31 |
Christiansen filters |
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A mixture of crushed glass and a liquid with the same index of refraction as glass is warmed in a container and exhibits colors. Directions for making a permanent display. Reference. |
6A40.36 |
grating pattern shift |
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Shine a laser beam through a grating so the beam splits the air/liquid interface and measure the difference in the diffraction pattern for the light passing through the air and liquid. |
6A40.36 |
grating in aquarium |
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Mount a transmission grating inside an aquarium and measure the diffracted laser beam on the other end with and without water in the tank. |
6A40.37 |
refraction with shadow and cube |
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A shadow projected through a glass cube has a different length than normal. |
6A40.38 |
refractive index of beer |
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The ratio of the apparent diameter to the actual diameter of a stick of pepperoni in a glass of beer gives the index of refraction. In the classroom, use a mesh projected on the wall and measure offset of a vertical wire. |
6A40.39 |
Abbe refractometer |
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A liquid separates the hypotenuses of two right angle prisms. |
6A40.40 |
variable index of refraction tank |
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Shine a laser beam through an aquarium with an unstirred sugar solution. |
6A40.40 |
variable index of refraction tank |
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How to make a tank with varying concentrations of benzol and CS2. |
6A40.42 |
gradient index lens |
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A small gradient index lens is passed around the class. It looks like a glass rod but one sees an inverted image when looking along the axis. |
6A40.45 |
mirage |
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How to heat a long plate to demonstrate the mirage effect. |
6A40.46 |
mirage |
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The image from a slide projector is directed just above a brass plate heated with a burner. |
6A40.47 |
mirage with a laser |
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A laser beam almost grazing a hot plate will show deflection when the hot plate is turned on. |
6A40.47 |
laser beam deflection - thermal grad |
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An apparatus for cooling a plate to deflect a laser beam downward. |
6A40.47 |
mirage with laser |
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A laser beam is imaged through a keyhole and the beam then passes through a 1 meter oven. |
6A40.47 |
superior "superior" image |
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A laser beam passing through a tank of water begins to deflect immediately when heat lamps are turned on. Images are also observed. |
6A40.48 |
not a mirage with a laser |
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I haven't figured this out and have to go home to eat, so maybe some other time. |
6A40.49 |
mirage explaination note |
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A note correcting misleading textbook explanations of the mirage. |
6A40.50 |
oil, water, laser |
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6A40.60 |
Schlieren image |
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6A40.60 |
cheap Schlieren |
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A small, compact, portable, and inexpensive Schlieren instrument using an ordinary lamp and a light source. |
6A40.60 |
Schlieren, etc. |
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Show and compare Schlieren, direct shadow, and interferometeric method of detecting small changes in the index of refraction of air. Diagrams, Details in appendix, p. 1352. |
6A40.61 |
Schlieren image of a candle |
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A simple arrangement with a point source, lens, and candle near the lens, aperture, and screen for lecture demonstration purposes. |
6A40.61 |
Schlieren image of a candle |
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Laser light is used in Schlieren projection of a candle flame. |
6A40.62 |
single mirror Schlieren system |
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Two Ronchi rulings are placed at the radius of curvature of a spherical mirror. |
6A40.63 |
Schmidt-Cassegrain schlieren |
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Two Schmidt-Cassegraion telescopes are used to make a simple inline Schlieren system. |
6A40.65 |
Toepler Schlieren apparatus |
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A simpler Schlieren setup with colors indicating amount of deviation. |
6A40.67 |
refraction by gases |
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Shadow project the Bunsen burner (H-137), hold a hot object in one arm on the Michelson interferometer. |
6A40.70 |
short beer |
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6A40.70 |
tall beer |
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Properly designed glassware makes the beer look taller. |
6A40.70 |
cylindrical lens and short beers |
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Analysis of the apparent inner diameter thick cylinder of a liquid of different index of refraction. |
6A40.70 |
short beers |
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Paint the inside of the illusion cylinder, (AJP 43(8),741). |
6A40.70 |
beer mugs |
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Two beer mugs were found that have the same outer dimensions and both appear to hold the same amount of beer when full, but actually differ in volume by a factor of two. |
6A40.70 |
short beer comment |
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Easy explanation. |
6A40.90 |
plasma laser-beam focusing |
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An expanded laser beam grazing a flat combustion flame from paint stripper is focused into a line. A second perpendicular flame gives a point. |
6A42. Refraction at Flat Surfaces
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A42.10 |
blackboard optics - refraction |
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Blackboard optics with a single beam and a large rectangle and prism of plexiglass. |
6A42.11 |
optical disk with glass block |
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A single beam of light on the optical disc is used to show refraction through a rectangular block of glass. |
6A42.12 |
refraction/reflection from plastic |
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Rotate a rectangle of plastic in a single beam of light. |
6A42.15 |
optical disc - semicircle |
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A single beam of light is refracted at the flat but not the curved side if it leaves along a radius. |
6A42.20 |
Big plastic refraction tank |
pira200 |
The light source can be rotated through 270 degreew to show refraction and total internal reflection for both air/platic and plastic/air interfaces. |
6A42.20 |
refraction tank |
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A rotatable beam of light in a tank of water containing some fluorescein. |
6A42.21 |
Nakamara refraction tank |
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6A42.22 |
big plastic refraction tank |
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6A42.24 |
force table refeaction tank |
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A small refraction tank is mounted on a force table. |
6A42.27 |
refraction |
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Three refraction demos - optical tank, ripple tank, glass block. |
6A42.30 |
refraction model - rolling |
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6A42.30 |
refraction model |
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An axle with independent 1" wheels rolls down an incline with one wheel on cloth, the other on the plain board. |
6A42.31 |
string models of refraction |
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String models of refraction representing a water tank, prism, thin lens, comma aberration, and astigmatism are shown. Pictures, Construction details in appendix, p.1345. |
6A42.32 |
wavefront strips model |
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6A42.35 |
ripple tank refraction |
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6A42.40 |
penny in a cup |
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6A42.40 |
seeing a coin |
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Pour water into a beaker until a coin at the bottom previously hidden by the side is visible. |
6A42.43 |
light in a tank |
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6A42.43 |
small refraction tank |
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Position a lamp in an opaque tank so the filament cannot be seen, then add water until the light from the filament is seen over the edge of the tank. |
6A42.45 |
stick in the water |
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6A42.45 |
stick in water |
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A stick appears bent when inserted into water at an angle. |
6A42.46 |
rugged refraction demonstration |
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Cast a stick in a tumbler filled with clear casting resin. Pass around the class. |
6A42.47 |
acrylic/lead glass refraction |
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Hold a stick behind stacked lead glass and acrylic blocks. The image of the stick is shifted when viewed off the normal to the surface of the blocks. |
6A42.50 |
minimum deviation of a prism |
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At minimum deviation light reflected off the base is parallel to that passing through an equilateral prism. |
6A42.50 |
minimum angle of deviation |
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Project a line filament through a large prism on a rotating platform with and without monochromatic filters. Reference: TPT 7(9),513. |
6A42.51 |
three prism stack |
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6A42.51 |
three different prisms |
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A stack of three prisms of different glass shows different refraction and dispersion. |
6A42.55 |
paraffin prism and microwaves |
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6A42.55 |
microwave paraffin prism |
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Determine the index of refraction of a large paraffin prism with 3.37 cm microwaves. |
6A42.60 |
dispersion in different media |
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A multiple element prism is made with layers of different plastic and glass. |
6A42.65 |
dispersion of liquids |
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A hollow prism is filled with a layer of carbon disulfide and a layer of water. |
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6A44. Total Internal Reflection
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A44.10 |
blackboard optics |
pira200 |
Multiple beams of light pass through large scale optical elements. |
6A44.11 |
optical disk with prism, semicircle |
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A single beam of light on the optical disk shows total internal reflection when passed through a prism. |
6A44.11 |
semicircular element on disc |
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A beam of light entering a semicircular glass disc normal to the curved surface is reflected off the flat side. |
6A44.20 |
critical angle in refraction tank |
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A beam in a tank of water is rotated until there is total internal reflection at the surface. |
6A44.20 |
refraction tank |
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Adjust the path of a beam with mirrors in a tank of water with fluorescein. to show total internal reflection. |
6A44.20 |
critical angle/ total internal refle |
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Shine a beam through the side of a tank containing fluorescein. Rotate a mirror in the tank so the beam passes through the critical angle. |
6A44.22 |
big plastic refraction tank |
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6A44.25 |
Snell's wheel |
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6A44.30 |
ripple tank total reflection |
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Vary the angle of incidence of ripple tank waves to a boundary with water depths of 13 and 3 mm. |
6A44.35 |
frust. tot. int. ref. |
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see 7A50.12 |
6A44.40 |
laser and fiber optics |
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Shine a laser into a curved plastic rod. |
6A44.40 |
laser and fiber optics |
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A laser is used with a bundle of fiber optics, a curled plexiglass rod, and a 1" square lean rod. |
6A44.40 |
light pipe |
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Light is projected down a clear plexiglass spiral. |
6A44.40 |
curved glass tube |
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Shine a bright light source through a curved glass tube. |
6A44.40 |
pira200 |
Several light pipes and fiber optics are shown. |
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6A44.40 |
light pipes |
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Shine a laser into a curved plastic rod. |
6A44.41 |
optical path in fibers |
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Shine a laser down a bent rectangular bar. |
6A44.42 |
steal the signal |
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6A44.43 |
bounce around a tube |
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A laser beam bounces around a thick walled plexiglass tube due to total internal reflection. |
6A44.45 |
water stream light pipe |
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Shine a laser beam down the water stream issuing from the orifice of a plexiglass tank of water. |
6A44.45 |
illuminated fountain |
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Shine a light down a stream of water. |
6A44.45 |
laser waterfall |
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Shine a laser down the center of a nozzle and it follows the water stream. |
6A44.50 |
light below surface |
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An underwater light illuminates powder on the surface of water to form a central spot of light. |
6A44.50 |
ring of light |
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Same as Oe-2. |
6A44.50 |
light below surface |
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An underwater light illuminates powder on the surface of water to form a central spot of light. |
6A44.51 |
ring of light index of refraction |
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Find the index of refraction of transparent plates by wetting a filter paper on one side, shining the laser in that side, and measuring the diameter of the light circle. |
6A44.52 |
ring of darkness |
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Shine a laser through a sample to a white diffusely reflecting surface and measure the darkened circle on the top surface. |
6A44.53 |
water/benzol surface |
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Total internal reflection from a water/benzol surface. |
6A44.54 |
hidden mercury in a test tube |
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Mercury in a partially filled test tube cannot be seen from above when immersed in water. |
6A44.54 |
total internal and metallic reflect |
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View a test tube half full of mercury half in water from an angle of 100 degrees to the incident beam. The glass-air interface is brighter. |
6A44.55 |
black ball turns silver |
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A soot covered ball appears silver under water due to reflected light from air trapped on the surface of the ball. |
6A44.55 |
soot ball |
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A ball covered with soot appears silvery in water due to the air trapped on the soot forming an air water interface. |
6A44.55 |
silver soot ball |
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A ball coated with soot appears silver in water. |
6A44.56 |
glass-air interface |
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Two thin strips of glass are sealed with an air barrier and immersed in water. Turned to the proper angle to the incident beam it will exhibit total internal reflection. |
6A44.56 |
near critical angle |
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Use the entrapped air slide in a water bath or air between right angle prisms to show the colors of the transmitted and reflected light near the critical angle. Dispersing the two beams will show complementary spectra. |
6A44.59 |
add water to snow |
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Project light through snow or chopped ice and add water. |
6A44.60 |
diamond |
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A thin beam of light is directed on a diamond and the reflections are projected onto a cardboard. |
6A44.65 |
inversion with a right angle prism |
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Project an image upside down and place a right angle prism in the beam to invert the image. |
6A44.65 |
right angle prism inverter |
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A right angle prism placed in a projected beam inverts the image. |
6A44.66 |
right angle prism - double reflectio |
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A beam entering the hypotenuse of a right angle prism is inverted and reversed. |
6A44.67 |
two right angle prisms - inversion |
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Two right angle prisms are arranged to invert and pervert the image. |
6A44.68 |
prisms |
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Several prisms demonstrate total internal reflection. |
6A44.70 |
Goos-Haenchen shift |
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The sideways displacement of a beam at total internal reflection is shown with 3 cm microwaves. |
6A46. Rainbow
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A46.10 |
rainbow |
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An arc lamp directed at a sphere of water forms a rainbow on a screen. |
6A46.10 |
rainbow |
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Project a beam through a spherical flask of water and view the rainbow on a screen placed between the light and the flask. |
6A46.11 |
artifical rainbow |
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Form a vertical circle "rainbow" by placing a tube of water between a prism and screen. |
6A46.12 |
secondary rainbow |
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Use a single sphere with the back surface coated with a reflecting material to show both primary and secondary bows with increased intensity. |
6A46.15 |
rainbow droplets |
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Small droplets formed by spraying an atomizer on a soot covered glass plate glisten like colored jewels when viewed at 41 degrees. |
6A46.16 |
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On using small glass spheres to generate bows and halos. |
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6A46.20 |
rainbow model |
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Depict a three dimensional model of the rainbow with strings representing light rays. |
6A46.25 |
rainbow |
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A mechanical model for demonstrating rainbow formation shows why the rainbow is produced and why size depends on the time of day. |
6A46.26 |
rod and dowel raindrop model |
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A rod and dowel raindrop model is used to show why a rainbow is bow-shaped. |
6A46.30 |
optical disc with spherical lens |
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A single beam into a circular glass element is refracted, totally internally reflected, and refracted out again. |
6A46.30 |
rainbow disc |
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A single beam is used with a spherical glass element on an optical board to show the path of refracted light that produces a rainbow. |
6A60. Thin Lens
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A60.10 |
blackboard optics - thin lens |
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Blackboard optics are used with convex and concave thin lens elements. |
6A60.11 |
optical disk with thin lens |
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The optical disk is used with multiple beams and a thin lens element. |
6A60.11 |
optical disc - lenses |
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Various lens elements are used with the optical disc. |
6A60.12 |
optical disc - refraction at curved |
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A long plastic slab with a concave surface at one end and a convex surface at the other is used in the optical disc. |
6A60.15 |
ripple tank convex lens |
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6A60.15 |
ripple tank - lens model |
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Refraction due to depth differences over a lens shaped area in the ripple tank. |
6A60.16 |
ripple tank concave lens |
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6A60.20 |
parallel lasers and lenses |
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Parallel lasers are passed through converging and diverging lenses. Chalk dust illuminates the beams. |
6A60.20 |
parallel lasers and lenses |
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Parallel lasers are used with chalk dust to show the path of rays through a lens and combinations of lenses. |
6A60.20 |
ray tracing with lenses |
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Show parallel rays passing through a lens element and converging. |
6A60.30 |
thin lens projection |
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Project the filament of a lamp with a thin lens. |
6A60.30 |
projected filament with lens |
pira200 |
Project the filament of a light bulb on the wall. The lens can be stopped down. |
6A60.30 |
thin lens projection |
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Project the filament of a lamp with a thin lens. |
6A60.30 |
real image formation |
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With a source and screen at the ends of a long optical bench, show the two positions a lens will produce an image. |
6A60.31 |
projected arrow with lens |
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Use an illuminated arrow with a converging lens to project an image on a screen. |
6A60.32 |
thin concave lens |
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Try to project an image with a thin concave lens. |
6A60.33 |
image location |
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A set of lenses for demonstration the six general cases for object and image distances. |
6A60.35 |
lens magnification |
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Place various lenses between a backlit grid and the class. |
6A60.40 |
position of virtual image with TV |
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Find the virtual image location by focusing on an object through a lens removing the lens, and moving the object to a focused position. Also the apparent depth with TV method. |
6A60.45 |
focal length of a lens - mirror |
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When a lamp is at the focal length, the image is at the same place if a mirror is placed directly behind the lens. |
6A60.48 |
effect of medium on focal length |
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Find the focal length of a lens, then find the focal length of the same lens in water. |
6A60.49 |
lenses |
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All sorts of focal length stuff. |
6A60.50 |
pinholes projected with lens |
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Pinholes are pricked in a black paper covering a long filament bulb. Bring the multiple images into one image with a converging lens. |
6A60.50 |
action of a lens |
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Project the images of a filament through several pinholes and then add a lens to collect the many into a single image. |
6A60.60 |
paraffin lens and microwaves |
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6A60.60 |
microwave lens |
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Construct a microwave lens and prisms of stacks of properly contoured aluminum sheets separated by just over one half the wavelength. |
6A61. Pinhole
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A61.10 |
pinhole projection |
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Place a lamp in a box covered with heavy paper and poke a hole in the paper with a wire 1-2 mm in diameter. Poke more holes for more images. Try different size holes. |
6A61.10 |
pinhole projection |
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Interpose a metal plate with two holes between a lamp and a screen on an optical bench. |
6A61.15 |
pinholes projected/lens |
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see 6A60.50 |
6A61.20 |
pinhole camera |
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Place film at the back of a box with a hole. |
6A61.20 |
pinhole camera |
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Project a lamp filament onto a screen. Vary the distance of the screen and the size of the pinhole. Includes animation. |
6A61.21 |
pinhole camera |
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A sliding box with has pinhole at one end and a frosted glass at the other. Try a 1" diameter hole in the shutter of a window in a darkened room. Directions on making a pinhole camera. |
6A61.22 |
pinhole imagery |
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A complete discussion of pinhole imagery. |
6A61.23 |
pinhole camera |
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A small tube covered with tin foil with a small hole replaces the lens of a TV camera. |
6A61.30 |
fish-eye camera |
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A pinhole camera filled with water or solid Lucite gives a fish-eye view. Diagram, Pictures. |
6A65. Thick Lens
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A65.09 |
computer assisted optics |
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The authors describe a program that covers spherical and chromatic aberration in addition to other topics. BASIC, PC, available from authors. |
6A65.10 |
improving an image with a stop |
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Use a stop to improve the image through a short focal length lens. |
6A65.11 |
depth of focus |
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Use a six inch long glowing wire as an extended object for showing the effect of stopping down a lens. |
6A65.15 |
optical disc - circular glass plate |
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Use a circular plate of glass with the optical disc as an example of a thick lens. |
6A65.20 |
chromatic aberration |
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A diaphragm moved near the focus selects red or blue light from beams passing through the edge of a lens. |
6A65.21 |
aplanic properties of a sphere |
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Aplanic systems show no spherical aberration or coma for some special position of object and image demonstrated here with a spherical lens. |
6A65.21 |
chromatic aberration |
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Project spots of light on a screen from several points on a lens. Note chromatic aberration and then add a second correction lens. |
6A65.22 |
chromatic aberration |
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Show the image formation distance for red and uv light using a fluorescent screen to display the uv. |
6A65.23 |
lens aberrations with a laser |
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Good quality telescope and microscope objectives are used to show aberrations in optical systems. |
6A65.24 |
chromatic and spherical aberration |
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Use diaphragms with central, annular, and other openings to show spherical and chromatic aberration. |
6A65.30 |
barrel and pincushion distortion |
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Project an illuminated wire mesh with a large lens. Place a diaphragm between the lens and the mesh for barrel distortion and between the lens and the screen for pincushion distortion. |
6A65.31 |
off axis distortion |
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Parallel rays of light pass through a lens element held off axis. |
6A65.34 |
astigmatism |
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Focus light from a circular hole on a screen, then add a cylindrical lens. |
6A65.35 |
astigmatism and distortion |
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An illuminated wire mesh is projected onto a screen with a short focal length condenser lens. Turn the lens about an axis parallel to either set of wires and the horizontal and vertical wires will focus at different points. |
6A65.40 |
spherical aberration |
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Project an image with a spherical planoconvex lens. Stop the outer portion of the lens, then the center. |
6A65.45 |
abberation with a plano convex lens |
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A series of parallel beams around the outside edge of a plano convex lens made visible with chalk dust are better focused when the light enters the curved side. |
6A65.46 |
spherical abberation and coma /laser |
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Diagram and pictures of a setup to project lens aberrations with a laser. |
6A65.52 |
water lens |
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A beam of light is directed through a round flask filled with water. |
6A65.52 |
fillable air lenses |
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Convex and concave lenses are filled with water and air in water and air. |
6A65.53 |
spherical lens |
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Compare a thermometer at the center of a water filled flask to one at the far side. Picture. |
6A65.54 |
wine bottle lens |
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Fill a round flask with a wine bottle bottom with water and fluorescein to show diverging light. |
6A65.55 |
watch glass lens |
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A vertical lens can be formed by pouring various liquids into a watch glass. |
6A65.56 |
CHOICE OXIDE |
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CHOICE OXIDE GLASS LAMP is viewed through a tube filled with water. |
6A65.58 |
light beam strikes rod |
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A light beam incident on the side of a glass rod at some angle will produce a cone with the half angle equal to the angle of incidence. |
6A65.60 |
plastic lenses |
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The advantages of plastic lenses. |
6A65.70 |
Fresnel lens history |
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An article on the discovery of stepped lenses. |
6A65.70 |
Fresnel lens |
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Fresnel lens magnification. Animation showing construction of a Fresnel lens. |
6A70. Optical Instruments
PIRA # |
Demonstration Name |
Subsets |
Abstract |
6A70.10 |
model microscope |
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Make a demonstration microscope with a short focal length lens and reading glass. |
6A70.12 |
microscope chart |
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A diagram on a wall chart shows the action of a microscope. |
6A70.13 |
fake microscope |
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A mirror arrangement and fake microscope make normal objects seem miniaturized. |
6A70.14 |
primative microscope |
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A Leeuwenhoek 100 X magnifier is made with a glass bead on the end of a tapered tube. |
6A70.20 |
telescope |
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Set up astronomical, terrestrial, and Galilean telescopes for students to look through individually. |
6A70.21 |
real telescope |
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Observe with a Questar telescope. |
6A70.22 |
sun telescope |
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Make a heliostat for a room with a south facing window. Reference: AJP 38(3),391-2. |
6A70.23 |
large telescopes |
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Large telescopes are available on the roof for observations. |
6A70.25 |
telephoto lens |
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An illuminated wire mesh is projected on a screen using a telephoto lens setup. |
6A70.30 |
camera model |
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6A70.31 |
cameras |
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Several cameras are exhibited. |
6A70.35 |
projector model |
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6A70.40 |
superposition of images |
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A wire screen placed at the point where a real image is formed is projected through a second lens to form a combined image. |
6A70.45 |
lens combinations |
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A projection lantern double lens system. |
6A70.50 |
measuring with moire fringes |
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A long discussion on measuring with moire fringes. Diagrams, Construction details in appendix, p.1346. |
6A70.60 |
changing beam size |
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The beam size may be changed with or without inversion by placing the second lens at the sum or difference of the focal lengths. |
6A70.65 |
entrance and exit pupil |
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An optical bench setup shows the concept of entrance and exit pupil. |