A diverging lens is made of material with refractive index `1.3` and has identical
Channel: Doubtnut
Date: 05/07/2020

A diverging lens is made of material with refractive index `1.3` and has identical concaves surfaces of radius `20 cm.` The lens is immersed in a transparent medium with refractive index `1.8.`  (a) What is now the focal length of the lens?  (b) What is the minimum distance taht an immersed object must be from the lens so that a real image is formed?