Conceptual Physics (12th Edition)

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

Chapter 26 - Think and Explain: 60

Answer

The average speed of light is less in any transparent material compared to its speed in vacuum.

Work Step by Step

In the atmosphere, light is continually absorbed and re-emitted, causing a small delay. This is discussed on page 492.
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