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[:Demonstrations:Demonstrations] | [[Demonstrations]] |
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[:Instructional:Home] | [[Instructional|Home]] |
The Eye
PIRA classification 6J
Grayed Demos are either not available or haven't been built yet. |
6J10. The Eye
PIRA # |
Demonstration Name |
Abstract |
6J10.00 |
The Eye |
|
6J10.10 |
eye model |
|
6J10.10 |
eye model |
|
6J10.10 |
model of the eye |
Show a take apart model of the eye. |
6J10.10 |
eye model |
The standard take apart eye model. |
6J10.21 |
water flask model of the eye |
A large flask filled with water, a little fluorescein, and some external lenses make a model of the eye in near and far sighted conditions. |
6J10.21 |
eye models |
A spherical lens filled with milky water represents the eyeball. Use a large lens in front of the sphere to show inverted image, near and far sightedness. |
6J10.30 |
blind spot |
|
6J10.30 |
blind spot |
Same as L-58. |
6J10.30 |
blind spot |
Move a white cross toward a white spot on the blackboard while the students close one eye. |
6J10.40 |
inversion of image of retina |
|
6J10.40 |
inversion of image on retina |
A small tube has three holes in a triangular pattern drilled in one end and a single hole in the other. Hold the triangular end near the eye and the pattern appears inverted. |
6J10.50 |
astigmatism |
Look at a chart of radial black lines. |
6J10.55 |
eyeglasses |
Project an image of concentric circles crossed by radial lines. Place a lens and then a correcting lens over the projection lens. |
6J10.60 |
chromatic aberration of the eye |
A purple filter is mounted in front of a straight filament lamp. |
6J10.80 |
resolving power of the eye |
|
6J10.80 |
resolving power |
The limit of resolving two filaments of an auto headlamp is 25 - 30 feet. ALSO - show slides of the "Navicula" made with green and UV light. Reference. |
6J10.81 |
resolving power with TV |
|
6J10.81 |
resolving power |
The camera zooms in on a vertical series of back illuminated double slits, each separated by half the distance of the preceding pair. |
6J10.85 |
Computer generated Sayce chart |
A valuable background discussion on the resolution of the eye and a computer generated Sayce is shown. An external slit is used to stop down the eye pupil. |
6J10.90 |
locating images by parallax |
An arrangement is shown for locating real and virtual images by parallax. |
6J11. Physiology
PIRA # |
Demonstration Name |
Abstract |
6J11.00 |
Physiology |
|
6J11.10 |
retinal fatigue - color disc |
|
6J11.10 |
retinal fatigue disc |
A red light placed behind a rotating disc with a slot at the border of half black and half white appears different colors depending on the direction of rotation. |
6J11.10 |
retinal fatigue - color disk |
A disk with a notch, half black, half white is spun in front of a red lamp. The lamp appears green or red depending on the direction that the disk spins. |
6J11.11 |
psychological colors |
A black and white patterned disc appears colored when rotated. |
6J11.20 |
visual fatigue |
|
6J11.20 |
visual fatigue |
Stare at a bright spot and a complementary color appears when the spot is turned off. |
6J11.22 |
after image and judgement of size |
The retinal fatigue image seems to change size. |
6J11.30 |
persistence of vision |
|
6J11.30 |
persistence of vision |
|
6J11.30 |
persistence of vision |
A wheel with circles with phase shifted dots painted on the rim is spun in strobed light. |
6J11.32 |
colored fans |
Paint a four bladed fan different colors and illuminate with a strobe. |
6J11.33 |
tubeless television |
Wave a wand at the point a projected image is focused. |
6J11.35 |
integration of light pulses |
If light intensity from a strobe that appears continuous at 3000 Hz is cut in half, it will appear continuous at about 1700 Hz. |
6J11.36 |
fluorescence of retina |
Shine an UV source with a visible filter toward the class and notice the luminous haze that covers the field of view. |
6J11.37 |
jarring the eye |
Stamp your foot while watching a free running oscilloscope. |
6J11.40 |
subjectivity of colors |
A red spot projected on the wall looks orange or brown if it is surrounded by white or black. |
6J11.42 |
Mach disk |
A spinning disk appears to have light and dark rings where it should be uniform. |
6J11.44 |
relative black and white |
A bright light shining on a black screen looks the same as a filtered light shining on a white screen. |
6J11.46 |
most sensitive to green light |
A stick moved up and down in a projected spectrum will appear to bend at the green light area. |
6J11.50 |
impossible triangles |
|
6J11.50 |
impossible triangles |
An optical illusion that depends on viewing angle. |
6J11.51 |
the square that ain't there |
A cutout of a square in black paper has the illusion of being a white square on top of black paper. |
6J11.52 |
optical illusions |
Compare the height to the width of a projected hat. |
6J11.55 |
perception |
Many cases of optical perception are discussed along with some audio and misc. phenomena. |
6J11.60 |
depth perception - special case |
Apparatus for demonstration of depth perception when due solely to the geometrical disparity of binocular vision. |
6J11.70 |
color blindness |
|
6J11.70 |
color blindness |
Use standard color-blindness slides or charts to test the students. |