Question

Two lenses A and B have power of 2D and -4 respectively what is the nature and length of each lens

Answer 1

Answer:

A. is concave in nature

focal length is - 0.2 m

B.is convex in nature

focal length 0.25 m

Answer 2

Answer:

it is a diverging lens as total power will be -2 and secondly its focal length will be negative