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Q.

Which among the following parts controls the amount of light entering the eye?


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a

Lens

b

Ciliary Muscles

c

Retina

d

Iris 

answer is D.

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Detailed Solution

Iris controls the amount of light entering the eye.
The eye is the sensory organ that enables us to see and respond to visible light and use visual information to see and recognise objects. The human eye is made up of numerous linked and coordinated components. The portion of the eye that regulates how much light enters the eye is called the iris. The iris is the coloured, elliptical portion of the human eye. According to the light intensity, it adjusts pupil dilation.
 
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