What is the least value for an index of refraction? A) 0 B) 0.5 C) 1 D) just less than 1 E) (1/2)^1/2

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Quizplus · Accepted Answer

The index of refraction represents how much a substance slows down light, relative to the speed of light in a vacuum. For any substance, the index of refraction must be greater than or equal to one, because the speed of light in any material is always less than or equal to the speed of light in a vacuum. Therefore, the least possible value for an index of refraction is 1.

What Is the Least Value for an Index of Refraction