When we look at a dark room for some time, we start making out the shapes of different objects present in the room. Give the reason for the following questions.
(a) How does this happen?
(b) What do you think would happen to the pupils of a person looking at objects in a dark room? Why would this happen to the pupils?
(c) When we start seeing different objects in a dark room, we are often not able to recognize the colours of these objects. Why does this happen?

Explanation

(a) In the dark room, pupil dilates after some time and allows sufficient light to enter the eye through it. This causes vision of shapes of different objects present in the dark room.
(b) Pupils dilate due to relaxation of ciliary muscles in the dark room so that the maximum amount of light can enter the eyes.
(c) It is so because we do not get proper reflection from the objects in a dark room.