Question

Which parts of the eye controls the intensity of light, while entering into the eye?

• A. Iris and ciliary muscles
• B. Iris and pupil
• C. Iris and cornea
• D. None

Answer 1

The Correct Option is B

To solve the problem, we need to identify which parts of the human eye are responsible for controlling the intensity of light entering the eye.

1. Function of the Iris:
The iris is the colored part of the eye that controls the diameter and size of the pupil. It acts like a diaphragm that adjusts the amount of light entering the eye based on lighting conditions.

2. Role of the Pupil:
The pupil is the opening in the center of the iris through which light enters the eye. The iris changes the size of the pupil to regulate the intensity of light entering the eye.

3. Combined Action:
Together, the iris and the pupil control the light intensity. The iris contracts or dilates the pupil based on whether the surroundings are bright or dim, thus adjusting the light that reaches the retina.

Final Answer:
The parts of the eye that control the intensity of light are \({\text{Iris and pupil}} \).