Q.

The eye lens change its focal length by

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a

compressing the eye lens to increase its focal length and radius of curvature

b

extending the eye lens to decreases its focal length and radius of curvature

c

compressing the eye lens to decrease its focal length and radius of curvature from relaxed position

d

all the above

answer is C.

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Detailed Solution

When ciliary muscles are relaxed the eye lens becomes thinner, then the focal length of the eye lens is maximum. When ciliary muscles are strained the eye lens becomes thicker, and the focal length of the eye lens is minimum.

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