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Q.

The maximum focal length of the eye-lens of a person is greater than its distance from the retina. The eye is

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a

always strained in looking at an object

b

strained for objects at large distances only

c

strained for objects at short distances only

d

unstrained for all distances

answer is A.

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Detailed Solution

The eye is always strained in looking at an object because as the maximum focal length is greater than its distance from the retina the eye must be always strained to decrease the radius of curvature so as to decrease focal length.
 

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