Question

Two lenses A and B have focal lengths of +20 cm and – 10 cm, respectively. What

is the nature of lens A and lens B?

a) concave lens and convex lens b) convex lens and concave lens

c) both concave lenses d) both convex lenses​

Answer 1

Answer:

B) convex lens and concave lens...

Answer 2

Explanation:

(a) Lens A is a convex lens (positive focal length) and lens B is a concave lens (negative focal length).