A convex lens of refractive index 1.5 has a focal length of 20 cm in air. Calculate the change in
Channel: Doubtnut
Date: 2020-01-03

A convex lens of refractive index 1.5 has a focal length of 20 cm in air. Calculate the change in its focal length when it is immersed in water of refractive index 4/3.