Question

which structure controls the amount of light that enters the eye?
a. cornea
b. pupil
c. lens
d. iris

Explanation:

The iris is a muscular structure that controls the size of the pupil, thereby regulating the amount of light entering the eye. The cornea is the clear front - part of the eye that helps with focusing light initially. The pupil is the opening through which light passes, and its size is controlled by the iris. The lens helps in changing the focal length to focus on objects at different distances.

Answer:

D. iris