Question

Calculate the power of a lens whose focal length is -20cm . identify the type of lens also.

Answer 1

Answer:

concave lens ( as focal length is negative )

p=1/f

p=1/-20

p= -0.05

please mark as brainliest.....

Answer 2

Answer:

POWER OF LENS=1/FOCAL LENGTH

=1/-20/100(AS FOCAL LENGTH NEEDS TO BE IN metre)

=100/-20

=-5D

Explanation:

THE LENS IS CONCAVE