Q.

A man who cannot see clearly beyond 5 m wants to see stars clearly. He should use a lens of focal length

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a

−100m

b

+5m

c

−5m

d

Very large

answer is C.

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Detailed Solution

For lens u= want's to see =∞ v= can see =−5m ∴ From 1f=1v−1u⇒1f=1−5−1∞⇒f=−5m
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A man who cannot see clearly beyond 5 m wants to see stars clearly. He should use a lens of focal length