Question

A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is
2/3 and their equivalent focal length is +30 cm. Then their individual focal lengths (in cm) are :
(1) -75. +50
(2) +10,-15
(3) +75, -50
-15.-10​

Answer 1

Answer:

2) +10,-15

Explanation:

A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is

2/3 and their equivalent focal length is +30 cm. Then their individual focal lengths (in cm)