Conceptual Physics (12th Edition)

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

Chapter 27 - Think and Explain - Page 517-518: 37

Answer

The interior of optical instruments are painted black so the surface absorbs light.

Work Step by Step

If the interior were to reflect light around inside the instrument, it would be distracting, and most likely also interfere with the primary image.
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