PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 2/3 . Their equivalent focal length is 30 cm. What are their individual focal lengths?
(1) −15,10
(2) −10,15
(3) 75,50
(4) −75,50