LIGHT

What cells are sensitive to bright light?
1. cones
2. rods
3. all the above
4. none of the above
What cells are sensltlve to dlm light?
1. cones
2. rods
3. all the above
4. none of the above
At the junction of the optic nerve and the retina, there are no sensory cells, so no vision is possible at that spot. This is called
1. white spot
2. blind spot
3. black spot
4. all the above
The impression of an image does not vanish immediately from the
1. iris
2. cornea
3. pupil
4. retina
What shut out light when not required?
1. eyelash
2. eyebrow
3. eyelids
4. all the above
The most comfortable distance at which one can read with a normal eye is about
1. 20 cm
2. 30 cm
3. 25 cm
4. 15 cm
If still Images of a moving object are flashed on the eye at a rate faster than 16 per second, then the eye perceives this object as
1. not moving
2. moving
Who developed a system for visually challenged persons?
1. Penicillin
2. Alexander
3. Louis Braille