Which of the following part of the eye regulates the amount of light entering into the eye by adjusting the size of the pupil?

Cornea

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Retina

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Iris

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Sclera

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Solution

The correct option is C Iris
Iris is a dark coloured muscular diaphragm which has a small circular opening in its middle. It regulates the amount of light entering into the eye by adjusting the size of the pupil.

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