A convex lens A of focal length 20 cm and a concave lens B

Last updated: 6/12/2023

A convex lens A of focal length 20 cm and a concave lens B of focal length 10 cm are kept along the same axis with a distance d between them If a parallel beam of light falling on A leaves B as a parallel beam then d is 10 cm 20 cm 30 cm 15 cm