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:

Options

A. only `(d)/4`
B. only `(d)/(2)`
C. more than `(d)/(4)` but less than `(d)/(2)`
D. less then`(d)/(4)`

Answer

B