An equi-convex glass lens with radius of each face as R is placed in air `(._au_g=3//2)`.
Channel: Doubtnut
Date: 23/08/2020

An equi-convex glass lens with radius of each face as R is placed in air `(._au_g=3//2)`. "If there is water in the object space and air in the image space and given" `._au_w=4//3`, the focal length of the lens is