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Q.

A magnifying glass is to be used at the fixed object at a distance of distance of 1 inch. lf 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  inchUsing  sign  convention  u=−1 inch, v=−5  inch∴1f=1v−1u=1−5−1−1⇒f=1.25  inch
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A magnifying glass is to be used at the fixed object at a distance of distance of 1 inch. lf it is to produce an erect image magnified 5 times. Its focal length should be