A lens of focal length f is placed in between a real object and a screen
PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction
Problem
A lens of focal length f is placed in between a real 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 length of the lens is:
(a) mX/(m+1)2
(b) mX/(m−1)2
(c) (m+1)2/mX
(d) (m−1)X/m