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Q.

A normal eye is not able to see objects closer than 25 cm because

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a

the distance of the retina from the eye-lens is 25 cm

b

the focal length of the eye is 25 cm

c

the eye is not able to decrease the focal length beyond a limit

d

the eye is not able to decrease the distance between the eye-lens and the retina beyond a limit

answer is D.

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Detailed Solution

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A normal eye is not able to see objects closer than 25 cm because the eye is not able to decrease the focal length beyond a limit since ciliary muscle are most strained, beyond that they do not strain. So, the focal length cannot be less than that. So, the eye cannot see objects clearly, for a distance less than 25 cm.

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