Question

A convex lens of focal length 25 cm and a
concave lens of focal length 10 cm are placed
in close contact with each other. Calculate the
lens power of this combination. [AI 2013]​

Answer 1

Answer:

Given the focal length of the convex lens, F = 25 cm. The focal length of the concave lens, f = - 10 cm. Hence, the lens power of this combination is.