A convex lens of focal length 40 cm is in contact with a concave lens of focal length…

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. What is the power of the combination? (1)

-1.5

dioptres (2)

-6.5

dioptres (3)

+6.5

dioptres (4)

+6.67

dioptres