   Chapter 25, Problem 60PE

Chapter
Section
Textbook Problem

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 d i = − d o , 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?

To determine

(a)

The focal length of the flat mirror.

Explanation

Given info:

Distance of image behind the mirror is equal to distance of object from the mirror.

di=do .... (1)

Formula used:

Formula for focal length of thin lens is,

1f=1d0+1di

Here,

• f is the focal length.
• d0 is the object distance.
• di is the image distance
To determine

(b)

The power of the flat mirror.

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