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A concave mirror of focal length f produ...

A concave mirror of focal length `f` produces a real image `n` times the size of the object. What is the distance of the object from the mirror?

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Here , size of image/ size of object =n
In case of concave mirror, if image is real then it must be inverted
m=-n =-v/u
m=n=v/u
from mirror formula
1/v+1/u=1/f
1+u/v =u/f
or 1+1/n=u/f
or u=(n+1)f/n
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