Question

When the ciliary muscles relax, the focal length of the eye lens

• A. remains the same
• B. increases
• C. decreases
• D. none of these

Answer 1

The correct option is B

increases

Looking at distant objects:

1. When the eye focuses on objects that are far away (at infinity), the ciliary muscles associated with the lens of the eye relax, causing the lens becomes thinner and become less curved.
2. The focal length of the eye lens increases as it becomes less curved. Thus, a clear picture of the distant object is formed on the retina. This allows us to clearly see distant objects.
3. Thus, when the eye focuses on a distant object, the ciliary muscles are relaxed and the focal length of the eye lens increases.

Hence, option B is the correct answer.