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B
Pupil
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C
Lens
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D
Iris
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Solution
The correct option is B Iris
Iris is the coloured part of the eye that controls the amount of light entering the eye by adjusting the size of the pupil, a hole shaped opening in the middle of the eye. Cornea is the transparent window of eye located within otherwise opaque sclera. It serves to refract the light rays. The lens capsule is clear membrane like structure that serves to refract and focus light rays on retina.