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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 

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a
−100m
b
+5m
c
−5m
d
Very large

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detailed solution

Correct option is C

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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