Answer
The light is absorbed in the glass or water, and is re-emitted after a short delay. This lowers the average speed of light in the transparent material.
Work Step by Step
This is discussed on pages 492-493.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 28 - Reading Check Questions (Comprehension) - Page 538-539: 13
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