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The distance between the object and real...

The distance between the object and real image formed by a lens is `D`. If the magnification is `m`, then the focal length of the lens is given by :

A

`(md)/((m+1)^(2))`

B

`(md)/((m+1))`

C

`(md)/((m-1)^(2))`

D

`(md)/((m-1))`.

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The correct Answer is:
A
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