42 A plano convex glass lens 3 2 of radius of curvature R 20

Last updated: 6/25/2023

42 A plano convex glass lens 3 2 of radius of curvature R 20 cm is placed at a distance of b from a concave lens of focal length 10 cm of A a What should be the distance a of a point object O from the plano convex lens so that the position of final image is independent of b 1 30 cm 2 20 cm 3 40 cm 4 60 cm elegram pee