Question

A lens has the power equal to -4d . What is the focal length and nature of the lens

Answer 1

ANSWER:-

FOCAL LENGTH= 0.25 metre

NATURE OF LENS= CONCAVE LENS

EXPLANATION:-

P=1/F

=1/-4

= -0.25 metre

THE NEGATIVE SIGN OF FOCAL LENGTH SHOES THAT IT IS A CONCAVE LENS

THANKS FOR ASKING

Answer 2

Focal length = 25cm

Nature of the lens = Concave lens