Q34 of 234 Page 270

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

When the eye is looking at a distant object the ciliary muscles get relaxed and the eye lens becomes thin, in the same way when the eye is seeing a nearby object these muscles contract and make the eye-lens thick. By changing the thickness of the eye lens while focusing the ciliary muscles helps in normal functioning of the normal human eye.


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32

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

 33

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 ?

 35

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

 36

There are two types of light-sensitive cells in the human eye:

(a) Where are they found ?


(b) What is each type called?


(c) To what is each type of cell sensitive?