Conceptual Physics (12th Edition)

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

Chapter 26 - Think and Discuss: 82


No, when light emerges from glass into air, it has the same speed it had just before it entered the glass.

Work Step by Step

The average speed of light in air is a constant. It doesn't matter where it has been or where it is going. When the light was traveling through the glass, it was slowed down, but the light that emerges into air immediately resumes its normal speed in air, which is very close to c. This is discussed on page 492.
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