Question

Fill in the blanks:

For a human eye lens, for nearby objects, focal length ____ while for far away objects focal length ____ .

• A. remains the same, decreases
• B. increases, decreases
• C. decreases, increases
• D. increases, remains the same

Answer 1

Answer: (C)

decreases, increases

The curvature of the eye lens can be modified to change its focal length to some extent by the ciliary muscles. When the ciliary muscles contract, the focal length of the eye decreases enabling us to see nearby objects clearly. Similarly, when the muscles are relaxed, the focal length increases. This enables us to see distant objects clearly.