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Q.

Which of the following changes occur when you walk out of bright sunshine into a poorly lit room?


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a

The pupil becomes larger

b

The lens becomes thicker

c

The ciliary muscles relax

d

The pupil becomes smaller 

answer is A.

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Detailed Solution

When you walk out of bright sunshine into a poorly lit room, the pupil becomes larger.
The reason for this is that in bright light, the size of the pupil of our eye is small. When we enter the dark room, due to the small size of the pupil, very little light enters our eyes. But after some time, the pupil expands, and we are able to see things as more light enters our eyes now.
 
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