A convex lens of focal length `f` is placed somewhere in between an object and a screen.
Channel: Doubtnut
Date: 2020-01-19

A convex lens of focal length `f` is placed somewhere in between an object and a screen. The distance between the object and the screen is `x`. If the numerical value of the magnification produced by the lens is `m`, then the focal lnegth oof the lens is .