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A body is located on a wall. Its image o...

A body is located on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex leng. The lens is placed at a distance d ahead of second wall, then the required focal length will be:

A

`only D/4`

B

`only D/2`

C

more than `d/4` but less than `d/2`

D

less than `d/4`

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