- Why was the inside of the eyeball model painted red?
(The red represented the blood vessel-rich inner surface of
- What does the coin-sized opening represent?
- How did the angle of the incident flashlight beam affect the
red-eye property of the model?
(When the flashlight beam and observer's vantage were at the
same angle, the red-eye effect was greatest. When the beam and
viewer were at different angles, the inside of the eye that the
observer could see was not illuminated and so appeared less red.)
Why does the angle of incident light affect the appearance of red-eye?
(If the light beam strikes the retina and reflects directly back
at the camera, then the reflected light is red. If the beam is angled
so that the reflected light doesn't travel back to the camera, then
the region of the retina that the observer can see is not illuminated
and therefore appears dark.)