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.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 26 - Think and Explain - Page 501-502: 60
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