Question

If the speed of light in a vacuum is twice that of the speed of light in a given material, what is the index of refraction for that material?

Answer 1

Refractive index of material is 2

Step-by-step explanation:

If speed of light in medium is v then speed of light in vacuum will be 2v

Refractive index = v1/v2 = 2v/v = 2