An equi biconvex lens u 1 5 of focal length 20 cm is cut

Last updated: 6/13/2023

An equi biconvex lens u 1 5 of focal length 20 cm is cut into two parts and placed in contact as shown in the figure A liquid of refractive index 1 3 is filled between the two parts of lens Then find the equivalent focal length of the combination in cm