Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 28 - Think and Do: 31


This is a writing exercise for the student, and answers will vary.

Work Step by Step

Sample: Hi Grandma! I texted you a drawing that I made. It shows that a mirror which is just half your height is enough to show your entire body, if it is placed at the correct distance from the floor. As you can see from the diagram, it doesn't even matter how far away the mirror is. If you move closer to the plane of the mirror, your image moves closer too. Try it and see! The formal proof depends on the law of reflection. If the mirror is mounted too high or low, it'll need to be a little longer, but a half-height mirror is sufficient when it is properly mounted.
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