Question

What is meant by refractive index? If the speed of light in a medium is 2/3rd of the speed of light in vacuum, find the refractive index of that medium.

Answer 1

Answer :

The ratio of speed of light in vacuum to the speed of light in medium is called refractive index

Let's speed of light in vacuum = C

Refractive index= C/(2C/3)

Refractive index = 3/2 = 1.5

Answer 2

Refractive index:

1. The ratio of speed of light in vaccum and speed of light in medium is defined as refractive index
2. It is denoted by n
3. n= c/v
4. refractive index is 3/2

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