Question

Amount of light entering the eye is controlled by:

• A. Iris
• B. Cornea
• C. Pupil
• D. Crystalline lens

Answer 1

The correct option is C

Pupil

Explanation for Correct Option:

Option C: Pupil:

1. It controls the amount of light that enters through iris.
2. It expands to capture more light which has low intensity and contracts to get less light which has high intensity. In this way it protects the eye.

Explanation for Incorrect Options:

Option A: Iris:

Light enters in the eye through iris but it does not controls its amount.

Option B: Cornea:

It focuses light ray on the retina but cannot control the amount of light entering.

Option D: Crystalline lens:

It focuses the refracted light on retina.

Hence, the correct option is option C.