JAMB Physics
The eye controls the amount of light reaching the retina by adjusting the
a.
Retina
b.
Optic nerve
c.
Cornea
d.
Iris
Correct answer: D
The iris is the muscle that controls the size of the pupil. It is responsible for regulating the amount of light that reaches the retina. In dark places, it reduces the size of the pupil to allow more light to reach the retina. In bright places, it contracts the retina to reduce the amount of light that reaches the retina.