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.

Demonstrations

Home

fw: TheEye (last edited 2013-07-12 18:17:43 by localhost)