Question

When the eye is looking at a distant object, then the focal length of the eye:

• A. increases
• B. decreases
• C. does not change
• D. becomes zero

Answer 1

The correct option is A

increases

When the eye is looking at a distant object, then the ciliary muscles of the eye are fully relaxed. The relaxed ciliary muscles of the eye pull the suspensory ligaments attached to the eye-lens tightly. The eye lens gets stretched and becomes thin. Therefore the focal length of the eye lens increases.