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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

`f=m/((m-1)^2) D`

B

`f=m/((m+1)^2) D`

C

`f=m/(m+1) D`

D

`f=m/(m-1) D`.

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