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How is the refractive index of a medium related to the speed of light in it?

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Question

How is the refractive index of a medium related to the speed of light in it?

Short Answer
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Solution

The absolute refractive index of a medium is the speed of light in vacuum divided by its speed in that medium. Thus, for a fixed speed in vacuum, the refractive index is inversely proportional to the speed of light in the medium.

\[n=\frac{c}{v}\]

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Chapter 4: Refraction of Light at Plane Surfaces - EXERCISE - 4 (A) [Page 81]

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Selina Concise Physics [English] Class 10 ICSE
Chapter 4 Refraction of Light at Plane Surfaces
EXERCISE - 4 (A) | Q 10. (b) | Page 81
Frank Physics Part 2 [English] Class 10 ICSE
Chapter 2 Light
Graded Assignment 2.1 | Q 10. | Page 115
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