The amount of light which enters the eye is controlled by :

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Eyeball

Retina

Iris

Cornea

answer is B.

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Detailed Solution

The Iris present behind the cornea controls the amount of light entering the eye.
In the iris, there is a small black opening through which light is passed. It is called the pupil. The iris controls the amount of light entering in the eye by controlling the size of the pupil.
Iris is also the part of the eye that gives colour to the eye. For example, when we say a person has brown eyes, we are actually referring to the iris.

Therefore, iris is the correct answer.

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