Question

List the parts of eye that controls the amount of light entering in it. Explain how they perform this function.

Answer 1

The pupil is the perforation in the iris. It is the pupil (or aperture of the eye) through which light enters our eyes. The relaxation and contraction of the muscular fibres of the iris regulate the opening and closing of the pupil. Hence, it is the pupil that controls the amount of light entering our eyes.