Part of eye which acts as diaphragm of photography is

Options

A. Pupil
B. Cornea
C. Iris
D. Lens.

Answer

To answer the question, "Part of eye which acts as diaphragm of photography is," we need to analyze the options provided and understand the function of each part of the eye.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the part of the eye that functions similarly to the diaphragm in a camera. The diaphragm in photography controls the amount of light that enters the camera.

2. **Analyzing the Options**:
- **Pupil**: The pupil is the opening in the center of the iris that allows light to enter the eye. It does not control the amount of light; rather, it is the result of the iris's action.
- **Cornea**: The cornea is the transparent front part of the eye that helps focus light. It does not regulate light entry like a diaphragm.
- **Iris**: The iris is the colored part of the eye that surrounds the pupil. It is a pigmented and opaque structure that regulates the size of the pupil, thereby controlling the amount of light that enters the eye.
- **Lens**: The lens focuses light onto the retina but does not control the amount of light entering the eye.

3. **Identifying the Correct Answer**: Since the iris regulates the amount of light entering the eye by adjusting the size of the pupil, it functions similarly to a diaphragm in a camera. Therefore, the correct answer is the **Iris**.

4. **Conclusion**: The part of the eye that acts as the diaphragm of photography is the **Iris**.