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# What is Meant by the Refractive Index of a Substance? - CBSE Class 10 - Science

ConceptRefraction of Light Refractive Index

#### Question

What is meant by the refractive index of a substance?

#### Solution

If i is the angle of incidence and r is the angle of refraction, we get:

sin i/sin r = constant
This constant value is called the refractive index of the medium in which light enters through air. Refractive index of a medium can also be expressed in terms of speed of light as follows:

1n2 ="speed of light in medium 1"/"speed of light  in medium 2"
Here, 1n2 is the refractive index of medium 2 with respect to medium 1.

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Solution What is Meant by the Refractive Index of a Substance? Concept: Refraction of Light - Refractive Index.
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