Question

Two lenses A and B have a power of +2.5D and – 1.5D respectively.
a. Identify the nature of the lens A and draw a neat figure to show the lens.
b. What is the focal length of lens A?
c. What is the power of the combination of the two lenses?

Plz give detailed answer ​

Answer 1

Answer:

refer the attachment

Explanation:

Two lenses A and B have a power of +2.5D and – 1.5D respectively.

a. Identify the nature of the lens A and draw a neat figure to show the lens.

b. What is the focal length of lens A?

c. What is the power of the combination of the two lenses?

Answer 2

Answer:

answer is in lenses topic of textbook , (in example) please refer that

or

it is given above