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## 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 Abstract 6A01.10 speed of light Demonstrate speed of light by the path difference method with a fast pulser and fast oscilloscope. 6A01.10 speed of light A fast pulser is used to demonstrate speed of light by the path difference method. 6A01.10 velocity of light The displacement of a pulse from a fast pulser is viewed on a sampling oscilloscope as the path length is changed. Insert different media in the path. 6A01.10 speed of light - moving reflector Fancy speed of light apparatus fully documented. Diagrams, Pictures. 6A01.11 pulser circuit A pulser circuit for the moving reflector speed of light apparatus. 6A01.11 speed of light - fast pulse Use a high repetition rate pulsed light from TRW to demonstrate the speed of light. 6A01.11 pulser circuit An LED pulser circuit that emits a 20 ns pulse. 6A01.11 pulser circuit A light pulser circuit based on the MV 10A LED. 6A01.11 speed of light - N2 laser pulser A N2 pulsed laser is used in the moving reflector setup. 6A01.12 speed of light - spark source Construction and properties of a spark light source. 6A01.15 microwave moving reflector A small microwave pulse generator gives short pulses. 6A01.20 speed of light - two path Fast flash through two paths to a photomultiplier tube. Diagrams, Pictures. 6A01.21 speed of light - two path A spot of the display trace of a fast oscilloscope is passed through two different paths to a photomultiplier tube whose output is displayed on the same trace. Diagram, Picture. 6A01.25 errata - corrected diagram Corrected diagram for figure 2 in AJP 37(8),818 (1969). 6A01.25 speed on light The MV50 LED is pulsed in this simple time of flight measurement. 6A01.25 speed of light - minimal apparatus An inexpensive time of flight apparatus using a strobed LED and voltmeter. 6A01.25 speed of light - time of flight An acoustico-optic modulator chops a laser beam in a time of flight setup. 6A01.25 speed of light choppers Use a 250 tooth commercial gear as a light chopper. 6A01.26 speed of light - phase shift Many circuits are given. Features a solid-state electro-optical light modulator to replace the Kerr cell. 6A01.27 optical radar A commercial (Optitron Inc.) speed of light apparatus with an ultraviolet pulser. 6A01.30 speed of light - rotating mirror The position of the reflected image from a rotating mirror is measured for clockwise and counterclockwise rotations. Diagram, Appendix, p. 1353. 6A01.31 speed of light - rotating mirror Photodiode detector with the rotating mirror. 6A01.31 speed of light - rotating mirror A laser beam is used with the rotating mirror method. Detector circuits given. 6A01.32 speed of light - combined method A rotating mirror chops the laser beam and a beam splitter gives near and far paths. 6A01.36 Leybold speed of light modification When both sides of the rotating mirror are exposed, deflections as large as 2 cm can be observed with the unaided eye. 6A01.36 Leybold speed of light rotation rate Instead of comparing the motor sound to a tuning fork, use a microphone to pick up the motor sound and display it on an oscilloscope, use Lissajous figures with a reference. 6A01.36 more Leybold improvements Use a solar cell with the AJP 32(7),567 technique. 6A01.36 Leybold speed of light improvements Find the lateral displacement of the returning beam with a photomultiplier on a carriage. 6A01.36 Leybold speed of light improvements Use a microphone, oscillator, and oscilloscope to measure the motor frequency of the Leybold speed of light apparatus. Reference: AJP 29(10),711. 6A01.38 speed of light - microwave interfer. The Doppler beat frequency from the detector is used to drive a spark generator. 6A01.40 speed of light - models Set up mirrors on the lab bench to help students visualize the standard methods. Do the sound analog (S-81). Set up a rotating mirror. 6A01.50 group velocity of light Measure the speed of light to 0.02% and verify the relationship between group and phase velocity. Low cost circuit is given.

# 6A02. Straight Line Propagation

 PIRA # Demonstration Name Abstract 6A02.10 light in a vacuum Place a flashing light in the bell jar to emphasize the point. 6A02.15 straight line propagation - shadows 6A02.15 straight line propagation of light A good point source shows straight line propagation of light by shadow projection. 6A02.15 straight line propagation Cast shadows with a point source. 6A02.16 propagation star An intense radiation point source limited by a star shaped aperture melts a star shaped pattern on a paraffin backed black foil. 6A02.35 chalk dust

# 6A10. Reflection From Flat Surfaces

 PIRA # Demonstration Name Abstract 6A10.05 optical design software Use commercial optical design software to model and display geometrical optics. 6A10.09 reflection model A string and pulley arrangement shows the minimum path for reflection from a flat surface. 6A10.10 blackboard optics - plane mirror Blackboard optics - plane mirror. 6A10.11 optical disk with flat mirror Use a single beam with the optical disk and a flat mirror element. 6A10.11 optical disk with flat mirror Turn the optical disk with a single beam of light hitting the mirror. 6A10.11 angle of incidence, reflection Aim a beam of light at a mirror at the center of a disc, rotate the disc. 6A10.15 laser and flat mirror Shine a laser at a flat mirror on the lecture bench and use chalk dust to make the beam visible. 6A10.18 microwave reflection Reflect a microwave beam off a metal plate into a receiver. 6A10.20 smooth and rough surface reflection Chalk dust sprinkled on a mirror blurs the image of a light reflecting onto the wall. 6A10.20 diffuse/specular reflection Show a beam on light reflecting off a mirror on an optics board. Replace the mirror with a sheet of paper. 6A10.21 diffuse reflection Hold frosted glass at various angles in a beam of light focused on the wall. 6A10.22 aluminum foil reflection Same as AJP 50(5),473. 6A10.22 scattering with aluminum foil Reflect light off a sheet of aluminum foil, then crumple and flatten it to create many facets. 6A10.24 reflection - normal and grazing Place a lantern and piece of clear glass midway between two walls and show the difference between reflecting by grazing on one wall and normal reflection on the other. Also compare glass and silvered at grazing and normal incidence. 6A10.25 ripple tank reflection 6A10.30 corner reflector Three reflectors are placed on the inside corner of a box. 6A10.30 corner cube Two mirrors at 90 degrees or three mirrors mutually perpendicular. 6A10.30 corner reflection Look at your image in a corner cube. 6A10.31 large corner cube Use large mirror wall tiles (12 in sq) to make a large corner reflector. 6A10.33 signaling mirror A plane mirror with a small unsilvered area in the center is used for signaling. Diagram. 6A10.35 perversion Perversion can be demonstrated in public with a license plate and a plane mirror. Sorry, no inversion. 6A10.37 parity reversal in a mirror View a Cartesian coordinate system in a mirror. 6A10.40 mirrors at an angle A candle placed between angled mirrors forms multiple images. 6A10.40 angled mirrors Two hinged front surface mirrors show multiple images of an object placed between them. Diagram. 6A10.40 hinged mirrors Mirrors angled at 60 degrees give one object and five images arranged in a hexagon. 6A10.41 hinged mirrors 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 hinged mirrors, kaleidoscopes Hinged mirrors are shown at 60 and 30 degrees along with 60 and 30 degree kaleidoscopes. 6A10.43 angled mirrors - laser spots The hyperboloid of revolution formed by the successive reflections of a laser beam on two plane angled mirrors is explained by a simple geometrical method. 6A10.44 hinged mirrors theory The theorem of Rosendahl is applied to the hinged mirror problem to predict the number of images formed at various inclinations. 6A10.45 parallel mirrors An infinite number of images are formed with a candle between parallel images. 6A10.45 barbershop mirrors Place objects between parallel mirrors and view them over one of the mirrors. 6A10.50 full view mirror 6A10.50 height of a mirror for full view Shades are pulled up from the bottom and down from the top covering a mirror until a person can just see their entire height. 6A10.51 large plane mirror A three foot plane mirror is used to show all of a six foot person. 6A10.60 candle in a glass of water A candle in front of a plate glass forms an image in a glass of water behind. 6A10.60 plane mirror 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. 6A10.60 location of image Place a sheet of glass between a burning candle and a glass of water so the image of the candle appears in the glass. 6A10.65 half silvered mirror box 6A10.65 Mirror Box 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. 6A10.76 sawblade optics Keep the sawblade perpendicular by lining up the reflection of the board in the sawblade.

# 6A20. Reflection from Curved Surfaces

 PIRA # Demonstration Name Abstract 6A20.10 blackboard optics - concave mirror Blackboard optics - concave mirror. 6A20.10 blackboard optics - convex mirror Blackboard optics - convex mirror. 6A20.10 concave and convex mirrors Shine parallel beams at convex and concave mirrors. Use a thread screen for display. 6A20.11 optical disc with curved mirrors Use the optical disc with multiple beams and curved lens elements. 6A20.11 optical disc - curved mirror Mount either concave or convex mirrors in the optical disc. 6A20.11 large optical disc A large translucent screen and large lens elements scale up the Hartl optical disc. Diagrams. 6A20.15 parallel lasers and curved mirrors Shine parallel lasers at converging and diverging mirrors and use chalk dust to make the beams visible. 6A20.20 spherical abberation in a mirror Shine parallel rays at spherical and parabolic mirror elements, noting the difference in aberration. 6A20.21 off focal point source A picture of the caustic formed by parallel laser rays incident on a parabolic mirror at 30 degrees. 6A20.24 concave mirrors - caustics Directions for making a large cylindrical or parabolic mirror element. 6A20.26 variable curved mirrors 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 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 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 A hidden flower at the center of curvature of a parabolic mirror appears in an empty vase. 6A20.30 lamp in the socket A 40 W lamp is projected onto an empty socket. 6A20.30 mirror and rose Hints for projecting a real image (rose) on an object (vase). 6A20.31 cold candle 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 Hold a candle and other objects at the center of curvature of a large convex mirror. 6A20.35 optic mirage Same as Oc-7. 6A20.35 optic mirage Derivation of additional "magic separations" of the Optic Mirage that give images. 6A20.35 optic mirage 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 Shine a light on an shiny object in the Optic Mirage and the reflections will look real. 6A20.37 red ball in hemisphere 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 A lamp pendulum is swung between the center of curvature and the principle focus on a concave mirror. 6A20.40 projected arrow with mirror A converging mirror is used to project an image of an illuminated arrow onto a screen. 6A20.40 image with a concave mirror A concave mirror is used to image a lamp filament on a screen or the wall. 6A20.41 projected filament with mirror 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 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 Try to project the image of a filament from a convex mirror. 6A20.45 convex and concave mirrors Large 16" convex and concave mirrors are shown. 6A20.45 concave and convex mirror Project a lamp image with a concave mirror, then try convex. 6A20.50 amusement park mirrors Cylindrical mirrors are made with ten inch radius of curvature. 6A20.51 convex mirror View the image of your nose in a 1/2" diameter steel ball through a short focal length lens. 6A20.60 lighting a cigarette 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 Remove the projection head of an overhead projector and hold a piece of paper at the focal point until it bursts into flame.

# 6A42. Refraction at Flat Surfaces

 PIRA # Demonstration Name Abstract 6A42.10 blackboard optics - refraction Blackboard optics with a single beam and a large rectangle and prism of plexiglass. 6A42.11 optical disk with glass block 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 Rotate a rectangle of plastic in a single beam of light. 6A42.15 optical disc - semicircle A single beam of light is refracted at the flat but not the curved side if it leaves along a radius. 6A42.20 refraction tank Rotate a beam of light in a tank of water containing some fluorescein. 6A42.20 refraction tank A rotatable beam of light in a tank of water containing some fluorescein. 6A42.21 Nakamara refraction tank 6A42.22 big plastic refraction tank 6A42.24 force table refeaction tank A small refraction tank is mounted on a force table. 6A42.27 refraction Three refraction demos - optical tank, ripple tank, glass block. 6A42.30 refraction model - rolling 6A42.30 refraction model 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 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 6A42.35 ripple tank refraction 6A42.40 penny in a cup 6A42.40 seeing a coin Pour water into a beaker until a coin at the bottom previously hidden by the side is visible. 6A42.43 light in a tank 6A42.43 small refraction tank 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 6A42.45 stick in water A stick appears bent when inserted into water at an angle. 6A42.46 rugged refraction demonstration Cast a stick in a tumbler filled with clear casting resin. Pass around the class. 6A42.47 acrylic/lead glass refraction 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 At minimum deviation light reflected off the base is parallel to that passing through an equilateral prism. 6A42.50 minimum angle of deviation 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 6A42.51 three different prisms A stack of three prisms of different glass shows different refraction and dispersion. 6A42.55 paraffin prism and microwaves 6A42.55 microwave paraffin prism Determine the index of refraction of a large paraffin prism with 3.37 cm microwaves. 6A42.60 dispersion in different media A multiple element prism is made with layers of different plastic and glass. 6A42.65 dispersion of liquids A hollow prism is filled with a layer of carbon disulfide and a layer of water.

# 6A44. Total Internal Reflection

 PIRA # Demonstration Name Abstract 6A44.10 blackboard optics Multiple beams of light pass through large scale optical elements. 6A44.11 optical disk with prism, semicircle A single beam of light on the optical disk shows total internal reflection when passed through a prism. 6A44.11 semicircular element on disc 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 A beam in a tank of water is rotated until there is total internal reflection at the surface. 6A44.20 refraction tank 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 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 6A44.25 Snell's wheel 6A44.30 ripple tank total reflection 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. see 7A50.12 6A44.40 laser and fiber optics Shine a laser into a curved plastic rod. 6A44.40 laser and fiber optics A laser is used with a bundle of fiber optics, a curled plexiglass rod, and a 1" square lean rod. 6A44.40 light pipe Light is projected down a clear plexiglass spiral. 6A44.40 curved glass tube Shine a bright light source through a curved glass tube. 6A44.40 light pipes Several light pipes and fiber optics are shown. 6A44.40 light pipes Shine a laser into a curved plastic rod. 6A44.41 optical path in fibers Shine a laser down a bent rectangular bar. 6A44.42 steal the signal 6A44.43 bounce around a tube A laser beam bounces around a thick walled plexiglass tube due to total internal reflection. 6A44.45 water stream light pipe Shine a laser beam down the water stream issuing from the orifice of a plexiglass tank of water. 6A44.45 illuminated fountain Shine a light down a stream of water. 6A44.45 laser waterfall Shine a laser down the center of a nozzle and it follows the water stream. 6A44.50 light below surface An underwater light illuminates powder on the surface of water to form a central spot of light. 6A44.50 ring of light Same as Oe-2. 6A44.50 light below surface 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 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 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 Total internal reflection from a water/benzol surface. 6A44.54 hidden mercury in a test tube Mercury in a partially filled test tube cannot be seen from above when immersed in water. 6A44.54 total internal and metallic reflect 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 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 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 A ball coated with soot appears silver in water. 6A44.56 glass-air interface 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 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 Project light through snow or chopped ice and add water. 6A44.60 diamond 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 Project an image upside down and place a right angle prism in the beam to invert the image. 6A44.65 right angle prism inverter A right angle prism placed in a projected beam inverts the image. 6A44.66 right angle prism - double reflectio A beam entering the hypotenuse of a right angle prism is inverted and reversed. 6A44.67 two right angle prisms - inversion Two right angle prisms are arranged to invert and pervert the image. 6A44.68 prisms Several prisms demonstrate total internal reflection. 6A44.70 Goos-Haenchen shift The sideways displacement of a beam at total internal reflection is shown with 3 cm microwaves.

# 6A46. Rainbow

 PIRA # Demonstration Name Abstract 6A46.10 rainbow An arc lamp directed at a sphere of water forms a rainbow on a screen. 6A46.10 rainbow 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 Form a vertical circle "rainbow" by placing a tube of water between a prism and screen. 6A46.12 secondary rainbow 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 Small droplets formed by spraying an atomizer on a soot covered glass plate glisten like colored jewels when viewed at 41 degrees. 6A46.16 rainbow dust On using small glass spheres to generate bows and halos. 6A46.20 rainbow model Depict a three dimensional model of the rainbow with strings representing light rays. 6A46.25 rainbow 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 A rod and dowel raindrop model is used to show why a rainbow is bow-shaped. 6A46.30 optical disc with spherical lens A single beam into a circular glass element is refracted, totally internally reflected, and refracted out again. 6A46.30 rainbow disc 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 Abstract 6A60.10 blackboard optics - thin lens Blackboard optics are used with convex and concave thin lens elements. 6A60.11 optical disk with thin lens The optical disk is used with multiple beams and a thin lens element. 6A60.11 optical disc - lenses Various lens elements are used with the optical disc. 6A60.12 optical disc - refraction at curved 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 6A60.15 ripple tank - lens model Refraction due to depth differences over a lens shaped area in the ripple tank. 6A60.16 ripple tank concave lens 6A60.20 parallel lasers and lenses Parallel lasers are passed through converging and diverging lenses. Chalk dust illuminates the beams. 6A60.20 parallel lasers and lenses 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 Show parallel rays passing through a lens element and converging. 6A60.30 thin lens projection Project the filament of a lamp with a thin lens. 6A60.30 projected filament with lens Project the filament of a light bulb on the wall. The lens can be stopped down. 6A60.30 thin lens projection Project the filament of a lamp with a thin lens. 6A60.30 real image formation 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 Use an illuminated arrow with a converging lens to project an image on a screen. 6A60.32 thin concave lens Try to project an image with a thin concave lens. 6A60.33 image location A set of lenses for demonstration the six general cases for object and image distances. 6A60.35 lens magnification Place various lenses between a backlit grid and the class. 6A60.40 position of virtual image with TV 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 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 Find the focal length of a lens, then find the focal length of the same lens in water. 6A60.49 lenses All sorts of focal length stuff. 6A60.50 pinholes projected with lens 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 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 6A60.60 microwave lens 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 Abstract 6A61.10 pinhole projection 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 Interpose a metal plate with two holes between a lamp and a screen on an optical bench. 6A61.15 pinholes projected/lens see 6A60.50 6A61.20 pinhole camera Place film at the back of a box with a hole. 6A61.20 pinhole camera 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 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 A complete discussion of pinhole imagery. 6A61.23 pinhole camera A small tube covered with tin foil with a small hole replaces the lens of a TV camera. 6A61.30 fish-eye camera A pinhole camera filled with water or solid Lucite gives a fish-eye view. Diagram, Pictures.

# 6A65. Thick Lens

 PIRA # Demonstration Name Abstract 6A65.09 computer assisted optics 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 Use a stop to improve the image through a short focal length lens. 6A65.11 depth of focus 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 Use a circular plate of glass with the optical disc as an example of a thick lens. 6A65.20 chromatic aberration 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 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 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 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 Good quality telescope and microscope objectives are used to show aberrations in optical systems. 6A65.24 chromatic and spherical aberration Use diaphragms with central, annular, and other openings to show spherical and chromatic aberration. 6A65.30 barrel and pincushion distortion 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 Parallel rays of light pass through a lens element held off axis. 6A65.34 astigmatism Focus light from a circular hole on a screen, then add a cylindrical lens. 6A65.35 astigmatism and distortion 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 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 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 Diagram and pictures of a setup to project lens aberrations with a laser. 6A65.52 water lens A beam of light is directed through a round flask filled with water. 6A65.52 fillable air lenses Convex and concave lenses are filled with water and air in water and air. 6A65.53 spherical lens Compare a thermometer at the center of a water filled flask to one at the far side. Picture. 6A65.54 wine bottle lens Fill a round flask with a wine bottle bottom with water and fluorescein to show diverging light. 6A65.55 watch glass lens A vertical lens can be formed by pouring various liquids into a watch glass. 6A65.56 CHOICE OXIDE CHOICE OXIDE GLASS LAMP is viewed through a tube filled with water. 6A65.58 light beam strikes rod 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 The advantages of plastic lenses. 6A65.70 Fresnel lens history An article on the discovery of stepped lenses. 6A65.70 Fresnel lens Fresnel lens magnification. Animation showing construction of a Fresnel lens.

# 6A70. Optical Instruments

 PIRA # Demonstration Name Abstract 6A70.10 model microscope Make a demonstration microscope with a short focal length lens and reading glass. 6A70.12 microscope chart A diagram on a wall chart shows the action of a microscope. 6A70.13 fake microscope A mirror arrangement and fake microscope make normal objects seem miniaturized. 6A70.14 primative microscope A Leeuwenhoek 100 X magnifier is made with a glass bead on the end of a tapered tube. 6A70.20 telescope Set up astronomical, terrestrial, and Galilean telescopes for students to look through individually. 6A70.21 real telescope Observe with a Questar telescope. 6A70.22 sun telescope Make a heliostat for a room with a south facing window. Reference: AJP 38(3),391-2. 6A70.23 large telescopes Large telescopes are available on the roof for observations. 6A70.25 telephoto lens An illuminated wire mesh is projected on a screen using a telephoto lens setup. 6A70.30 camera model 6A70.31 cameras Several cameras are exhibited. 6A70.35 projector model 6A70.40 superposition of images 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 A projection lantern double lens system. 6A70.50 measuring with moire fringes A long discussion on measuring with moire fringes. Diagrams, Construction details in appendix, p.1346. 6A70.60 changing beam size 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 An optical bench setup shows the concept of entrance and exit pupil.

fw: GeometricalOptics (last edited 2020-03-14 22:00:37 by srnarf)