Question

Power of the lens is -4 D, its focal length is

a 4m

b -40m

c -0.25m

d -25m
choose the correct one​

Answer 1

Answer:

(c) -0.25m I hope this answer is useful

Answer 2

Answer:

Here is the answer:

Explanation:

As power =1/f

So -4D=1/f

so f=1/-4

=-0.25m.

So -0.25m is the required focal length.

HOPE IT HELPS.