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When you see in dim light the size of yo...

When you see in dim light the size of your pupil becomes:

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When the light from the torch falls on the pupil, its size becomes smaller to allow less amount of the light enter into the retina.
When the light was not falling on the pupil, its size was bigger, to allow more light enter into the retina.
It happened so to control the amount of light entering into the eye.
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