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Question

A lens of focal length f forms an image of magnification n, The distance of object from the lens in terms of f and n is
  1. (1+n)f
  2. (1n)fn
  3. fn
  4. nf(1n)


Solution

The correct option is B (1n)fn
We have, 
magnification n=ff+u
Here u is distance of object from lens and
f is focal length

f+u=fn
u=fnf
u=f(1nn)

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