Conceptual Physics (12th Edition)

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

Chapter 15 - Think and Explain: 78

Answer

After one crafts a precisely shaped telescope mirror, it would be a shame for the glass to shrink or expand significantly at different temperatures, which would wreak havoc with the optics.
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