Materials Science and Engineering: An Introduction

Published by Wiley
ISBN 10: 1118324579
ISBN 13: 978-1-11832-457-8

Chapter 21 - Optical Properties - Questions and Problems - Page 866: 21.6



Work Step by Step

For a material to have an index of refraction less than unity, this implies that the velocity of light propagating through this material is greater than the speed of light. As light propagates quickest in a vacuum, this is not possible.
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