Question

Two lenses A and B have focal lengths + 20 cm and -10 cm respectively.
a) What is the nature of Lens A and lens B?
b) What is the power of lens A and lens B?
c) What is the power of combination if lenses A and B are held together?

Answer 1

a)concave
b)convex
c)10

Answer 2

Answer:

Step-by-step explanation:

Hope you understood.