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 .A. `(mx)/((m+1)^(2))`B. `(mx)/((m-1)^(2))`C. `((m+1)^(2))/(m) x`D. `((m-1)^(2))/m x`

A convex lens of focal length `f` is placed somewhere in between an ob

1.	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 .A. `(mx)/((m+1)^(2))`B. `(mx)/((m-1)^(2))`C. `((m+1)^(2))/(m) x`D. `((m-1)^(2))/m x`
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