Question

Which of the following is not true for the eye lens?

• A. It is composed of a fibrous, jelly-like material.
• B. Its curvature can be modified to some extent by the ciliary muscles.
• C. When the muscles are relaxed, the lens becomes thin.
• D. When the muscles are relaxed, the lens becomes thick.

Answer 1

Answer: (D)

When the muscles are relaxed, the lens becomes thick.

The eye lens is composed of fibrous, jelly-like material. Its curvature can be modified to some extent by the ciliary muscles. The change in the curvature of the eye lens can thus change its focal length. When the muscles are relaxed, the lens becomes thin. Thus option $D$ is incorrect.