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Q.

A magnifying glass is to be used at the fixed object distance of 1 inch. If it is to produce an erect image magnified 5 times its focal length should be

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a

0.2 inch

b

0.8 inch

c

1.25 inch

d

5 inch

answer is C.

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Detailed Solution

m=vu=5⇒v=5 inch ( Given u=1 inch )  Using sign convention u=−1 inch ,v=−5 inch  ∴1f=1v−1u=1−5−1−1⇒f=1.25 inch
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