Question

Power of lens is - 40 d. What is focal length

Answer 1

P=-40D

We know,

P=1/f

-40=1/f

f=-1/40 m

Answer 2

Answer:

focal length= -0.025 meters

Explanation:

formula

power[P]=1/focal length[f]

-40=1/f

f=1/-40

f= -0.025 meters