Question

1. Power of a lens is -5 diopter then its focal length is.
a)-5m b)-0.2m
c)-0.25m​

Answer 1

c. -0.25m

focal length

Answer 2

Answer:

-.0.2 m is the answer.

Explanation:

as power of lens is defined as the reciprocal of the focal length. so,

focal length (f) = 1

_____________

power of lens

= 1

______

-5

= -0.2 m