Q.

A convex lens of focal length f produces a virtual image n times the size of the object. Then the distance of the object from the lens is

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a

n−1f

b

n+1f

c

n−1nf

d

n+1nf

answer is C.

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Detailed Solution

n=ff+u⇒f+n=fnor        u=fn−f=1−nnfor        u=−n−1nf,     u=n−1nf.
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