A parallel beam of light enters a convex lens of focal

Last updated: 6/1/2023

A parallel beam of light enters a convex lens of focal length 50 cm A concave lens of focal length 20 cm is kept coaxially at a distance D behind the convex lens such that rays coming out of concave lens are parallel again Here the D is equal to 1 20 cm 2 30 cm 3 40 cm 4 80 cm