Why is the index of refraction always greater than or equal to 1?

University Physics Volume 3
17th Edition
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
Publisher:William Moebs, Jeff Sanny
Chapter1: The Nature Of Light
Section: Chapter Questions
Problem 2CQ: Why is the index of refraction always greater than or equal to 1?
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Why is the index of refraction always greater than or equal to 1?

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