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Question

A concave mirror of focal length 'f' produces an image 'n' times the size of the object. If the image is real then the d distance of the object from the mirror is

A
(n+1)f
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B
(n+1)fn
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C
(n1)fn
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D
(n1)f
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Solution

The correct option is C (n+1)fn
Since the image is real, it must be inverted and magnification ratio should be negative.
Mgnification =vu
n=vd , u=d is the distance of object and and image distance is v
v=nd
Now using mirror formula
1f=1v+1u
1f=1nd+1d
So d=f(n+1)n

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