Question

Which of the following regulates the amount of light entering the eye?

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

Answer 1

The correct option is B

Iris

The correct option is B.

Explanation for correct option:

1. The iris controls the amount of light entering the eye.
2. Iris is a small circular opening in the lens of the eyes that can change its size to control the amount of light entering in the eye.
3. This helps us to adjust our eyesight in accordance with the environmental conditions.

Explanation for incorrect options:

Option A

1. A lens is a curved structure present in the eye that bends the light and focuses it on the retina
2. It helps us to see images/objects clearly.

Option C

1. It covers the iris, pupil, and anterior chamber of the eyes.
2. Its main function is to focus most of the light that enters the eye.

Option D

1. The retina is a thin layer that lines the back of the eye.
2. It is located near the optic nerve.
3. Its role is to receive the light that the lens has focused on it, then converts the light into neural signals and send these signals to the brain for recognition of images/objects.

Final answer: Iris regulates the amount of light entering the eye.