Question

The focal length of a concave mirror is 20cm. The power of the image is

Answer 1

hii frnd here is your answer.

focal length of a concave mirror = - 20cm
= -0.20cm


then ,

power = 1/ focal length

= 1/ -0.20

= - 5d

hope it will help you if it is right then mark as brainalist first

Answer 2

the power of image =1/f
therefore
power =-1/20.
if my answer is helpful for you then please mark as brain liest