Question

What happens to the size of pupil in the bright light and
why?

Answer 1

In dim light, your pupil expands to allow more light to enter your eye. In bright light, it contracts. More light creates more impulses, causing the muscles to close the pupil. Part of the optic nerve from one eye crosses over and couples to the muscles that control the pupil size of the other eye.

Answer 2

(a)

(i) In dim light, pupil becomes large.

(ii) in bright light, pupil becomes small.

(b)

(i) Cones

(ii) Rods

(iii) Cones