A point object O is placed at a distance of 20 cm from a convex lens of focal length 10 cm
PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
A point object O is placed at a distance of 20 cm from a convex lens of focal length 10 cm. At what distance x from the lens should a concave mirror of focal length 60 cm, be placed so that final image coincides with the object?
(a) 10 cm
(b) 15 cm
(c) 140 cm
(d) final image can never coincide with the object in the given conditions