Question

Consider the following statements:

1. Ciliary muscles adjust for changing the intensity of light entering the eye.
2. Myopic eye can be corrected by converging lenses of suitable power.
3. The function of the pupil is to regulate the quantity of light entering the eye.
4. When ciliary muscles are completely relaxed, the focal length of the eye lens is maximum.

The correct statements are:

• A. i, ii and iv
• B. i, ii and iii
• C. iii and iv
• D. ii and iv

Answer 1

The Correct Option is C

Analysis of each statement:

i. False. Ciliary muscles adjust lens shape for focusing (accommodation). Light intensity regulation is by the iris and pupil.

ii. False. Myopia (nearsightedness) is corrected with diverging lenses. Converging lenses correct hyperopia (farsightedness).

iii. True. The pupil, an opening in the iris, controls light entry. It constricts in bright light and dilates in dim light.

iv. True. Relaxed ciliary muscles lead to a less curved lens, increasing focal length for distant object focus.

Conclusion: Statements iii and iv are correct.