Conceptual Physics (12th Edition)

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

Chapter 26 - Reading Check Questions (Comprehension): 26

Answer

The middle, totally dark part of a shadow is called the umbra. The partial shadow, the less-dark part at the edges, is called the penumbra.

Work Step by Step

This is discussed on pages 493-495, and shown in Figures 26.12 and 26.13.
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