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: 37


The spectral "lines" would be tiny different-colored dots. The overall pattern would be much dimmer.

Work Step by Step

In a spectroscope, the spectral "lines" are different-colored images of the "slit". This is discussed on page 566. If large holes were used, the images of the dots might overlap, limiting the spectroscope's resolution. However, a small hole would let through much less light than a slit of equal width, making the spectrum dim and difficult to interpret. Thus, spectroscopes are designed with slits, instead of holes.
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