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Power of a Lens

Focal length ...

Question

Focal length of eye lens is maximum when one is looking an object at

A

least distance of distinct vision

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B

near to eye

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C

infinity

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D

none of these

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Solution

The correct option is C
infinity

Explanation
When the object is at infinity the rays coming in the eye lens are refracted from the eye lens and are focused at a point in the retina so the focal length is maximum in this case.
Focal length of the eye lens is maximum when one is looking an object at infinity
Hence, the correct answer is option (d)

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