Which part of the eye regulates the amount of light allowed into the eye?
A) pupil
B) lens
C) cones
D) rods

Question

Quizplus · Accepted Answer

The pupil is the part of the eye that regulates the amount of light that enters the eye. It is the black circular opening in the center of the iris, and its size is controlled by the muscles in the iris. When the light is bright, the pupil constricts or becomes smaller, reducing the amount of light that enters the eye. Conversely, when the light is dim, the pupil dilates or becomes larger to let in more light.

Which Part of the Eye Regulates the Amount of Light