Question

In an eye, muscular diaphragm between aqueous humour and the lens is called

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

Answer 1

The Correct Option is A

To solve the problem, we need to identify the muscular diaphragm in the eye that lies between the aqueous humour and the lens.

1. Understanding the Eye's Anatomy:
The eye has several key structures that help in vision. The area between the aqueous humour (a fluid-filled chamber) and the lens contains a muscular diaphragm that controls the size of the pupil and thus regulates the amount of light entering the eye.

2. Role of the Iris:
The iris is the muscular diaphragm that controls the size of the pupil. It is located between the aqueous humour and the lens. The iris adjusts the pupil size to control the amount of light entering the eye, which helps in proper focusing and vision.

3. Verifying Other Options:
- The pupil is the opening in the center of the iris, but it is not the diaphragm itself.
- The retina is the light-sensitive layer at the back of the eye, not involved in controlling light entry.
- The cornea is the transparent front layer of the eye, but it does not serve as a diaphragm for light control.

Final Answer:
The muscular diaphragm between the aqueous humour and the lens is called the $ \mathbf{Iris} $.