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 .​

Answer 1

Answer:

-0.14 D

Explanation:

convex

p=1/f

p=1/25

p=0.04d

concave

p=1/f

p=1/-10

p= -0.1 d

convex + concave

0.04 + 0.1

-0.14 D