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Physics Question on Ray optics and optical instruments

A converging lens has a focal length of 0.12 m0.12\, m . To get an image of unit magnification the object should be placed at what distance from the converging lens?

A

0.24 m0.24\, m

B

0.12 m0.12\, m

C

0.06 m0.06\, m

D

0.4 m0.4\, m

Answer

0.24 m0.24\, m

Explanation

Solution

Given: f=+0.12 mf=+0.12\,m (converging lens),
m=−1m=-1
To get a unit magnification from a converging lens , i.e., convex lens, the object must be placed at 2F2F
u=−2×0.12 mu=-2\times 0.12\,m
=−0.24 m=-0.24\,m