Question

A convex lens having focal length 30cm is kept a distance d from concave lens of focal length 10cm lf parallel beam of light incident on convex lens leaves concave lens as parallel beam, then what is the distanc
e between the
o lensesti
10. A lens luvang lucal length i escullu two parts and they are placed in town in ligure. W​

Answer 1

A convex lens of focal length 30 cm and a concave lens of 10 cm focal length are placed so as to have the same axis. If a parallel beam of light falling on convex lens leaves concave lens as a parallel beam, then the distance between two lenses will be 20 cm.

hope it helps

Answer 2

thank you jayanti for like my post and just pawri ( at home (((( )