Question

Ray tracing for a flat mirror shows that the image is located a distance behind the mirror equal to the distance of the object from the mirror. This is stated dᵢ=−dₒ, since this is a negative image distance (it is a virtual image). (a) What is the focal length of a flat mirror? (b) What is its power?

a) 0.00 m, 0.00 D
b) [infinity] m, 0.00 D
c) [infinity] m, [infinity] D
d) 1.00 m, 1.00 D

Answer 1

The focal length of a flat mirror is infinity and its power is 0.00 D.

Step-by-step explanation:

The focal length of a flat mirror is infinity since it does not converge or diverge light like a lens does. Therefore, option (b) [infinity] m, 0.00 D is the correct answer.

The power of a mirror is calculated as 0.00 D since power is the reciprocal of the focal length, which is infinity for a flat mirror.