Question

Choose the correct alternative which matches second and third column .

Column I	Column II	Column III
I. Thickening of eye lens	A. Focal length increases	i. Ciliary muscles contract
II. Thining of eye lens.	B. Focal length decreases	ii. Ciliary muscles elongate

• A. (I)- (B)- (i), (II)-(A)-(ii)
• B. (I)-(B)-(ii), (II)-(A)-(i)
• C. (I)-(A)-(i), (II)-(B)-(ii)
• D. (I)-(A)-(ii), (II)-(B)-(i)

Answer 1

The correct option is A (I)- (B)- (i), (II)-(A)-(ii)

When the ciliary muscles contract, then the eye lens becomes thick and thus the focus of the eye lens shifts nearer to the lens. Hence the focal length of the eye lens decreases.

On the other hand, when the ciliary muscles elongate, then the eye lens becomes thin and thus the focus of the eye lens shifts away from the lens. Hence the focal length of the eye lens increases.