Question

Which part of the human eye controls the amount of light entering it?

• A. Lens
• B. Retina
• C. Iris
• D. Cornea

Hint:

Iris = Controls pupil size → Light control. Lens = Focus, Retina = Image, Cornea = Protection.

Answer 1

The Correct Option is C

The part of the human eye that controls the amount of light entering it is the Iris. The iris is a thin, circular structure situated in front of the eye's lens, and it is responsible for regulating the size of the pupil. By adjusting the pupil size, the iris controls the amount of light that reaches the retina. When exposed to bright light, the iris constricts the pupil to reduce the light entering the eye. Conversely, in dim light, it dilates the pupil to allow more light in. This mechanism helps protect the retina and improves vision under varying light conditions.