The eye controls the amount of light reaching the retina by adjusting the
Answer Details
The sentence is stating that there is a part of the eye responsible for controlling the amount of light that reaches the retina. This part must be able to adjust and regulate the amount of light that passes through the eye. The options provided are: cornea, iris, retina, and optic nerve. Based on this information, the correct option is iris, because the iris is the part of the eye that controls the size of the pupil and regulates the amount of light entering the eye.