An equi-convex lens, having radius of curvature 33 cm is placed on a horizontal
Channel: Doubtnut
Date: 23/08/2020

An equi-convex lens, having radius of curvature 33 cm is placed on a horizontal plane mirror and a pin held 20 cm above the lens coincides with its image. Now the space between the and the mirror is filled with a liquid in order to coicide with the image the pin has to be raised by 5 cm. The refractive index of the liquid is