Question

The focal length of the eye lens increases when eye muscles:

• A. are relaxed and lens becomes thinner.
• B. contract and lens becomes thicker.
• C. are relaxed and lens becomes thicker.
• D. contract and lens becomes thinner.

Answer 1

The correct option is A are relaxed and lens becomes thinner.

When the muscles are relaxed, the lens becomes thin. Thus, its focal length increases, hence, option $A$ is correct