A convex lens of focal length 20 cm and a concave lens of focal length 5 cm are kept…

PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

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

leaves

B

as a parallel beam, then

d

is equal to ..... cm.