A person walking in a dark corridor enters into a brightly lit room:

(a) State the effect on the pupil of the eye.

(b) How does this affect the amount of light entering the eye ?

What happens to the eye when you enter a darkened cinema hall from bright sunshine? Give reason for your answer.

Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?

Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye ?

Describe and explain, how a normal eye can see objects lying at various distances clearly.