Question

How does the eye regulate the amount of light that falls on the retina?

Answer 1

The eye is a sense organ used for the purpose of vision. Rods and cones are two types of photoreceptors present in the retina of the eye. The size of the pupil regulates the amount of light entering the eye. In presence of bright light the pupil contracts to limit the amount of light entering the eyes. In presence of dim light, the pupils dilate to increase the amount of light entering the eyes.