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Question

When we enter in a dark room from a bright area, our vision is impaired for few seconds. Why does this happen?


A

We cannot see in dark room

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B

Our eye shifts the retina more closer to our eye lens to form the image correctly

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C

Pupil takes time to adjust

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D

Rods and cones are ineffective in dark

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Solution

The correct option is C

Pupil takes time to adjust


When we are in bright light the pupil contracts to allow adequate amount of light sufficient for visibility but as we enter a dark room the amount of light passing through the pupil is not sufficient to assist visibility. Hence, our pupil expands. This adjustment takes a few seconds till which our visibility is impaired.


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