Conceptual Physics (12th Edition)

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

Chapter 30 - Think and Explain - Page 579-581: 36

Answer

The investigator should use a crescent-shaped slit in the spectroscope.

Work Step by Step

In a spectroscope, the spectral lines are different-colored images of the slit. This is discussed on page 566. If the slit were crescent-shaped, the spectral lines would be too.
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