A convex lens A of focal length `20 cm` and a concave lens B of focal length `5 cm` are
Channel: Doubtnut
Date: 2020-07-05

A convex lens A of focal length `20 cm` and a concave lens B of focal length `5 cm` are kept along the same axis with a distance d between them. If a parallel beam of light falling on A and B as a parallel beam, then d is equal to ……cm