Question

Power of a lens is -4 d what is its focal length

Answer 1

Answer:

-0.25 m

Explanation:

P=1/f

f=1/p

=-1/4

f= -o.25 m

Answer 2

Answer:

Focal length=1/power (m)

focal length=-1/4m

f=-0.25m

And, focal length=100/power(cm)

f=-25cm

Explanation:

Hope it helps you frnd.....