Single Answer MCQ
Q-00001688
How does the eye lens adjust its curvature to change its focal length?
1
By changing the size of the cornea
2
By changing the shape of the iris
3
By contracting and relaxing the ciliary muscles
4
By adjusting the size of the pupil
Answer and Solution
Answer
C. By contracting and relaxing the ciliary muscles
Solution:
The eye lens adjusts its curvature to change its focal length by the contraction and relaxation of the ciliary muscles. When the ciliary muscles contract, the lens becomes thicker for focusing on nearby objects, and when they relax, the lens becomes thinner for focusing on distant objects. Therefore, the correct answer is 'By contracting and relaxing the ciliary muscles'.
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