#acl Narf:read,write,delete,revert,admin FacultyGroup:read,write All:read == The Eye == ''PIRA classification 6J'' ||<#dddddd>Grayed Demos are either not available or haven't been built yet. || = 6J10. The Eye = ||<10% style=""text-align:center" ">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets''' ||<60% style=""text-align:center" ">'''Abstract''' || ||6J10.10 ||eye model ||pira200 ||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. || ||6J10.30 ||blind spot || ||Move a white cross toward a white spot on the blackboard while the students close one eye. || ||6J10.40 ||inversion of image 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 || ||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 || ||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 = ||<10% style=""text-align:center" ">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets''' ||<60% style=""text-align:center" ">'''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]] [[Instructional|Home]]