Question

The speed of light in a certain material is 50% of its speed in a vacuum. What is the refractive index of this material?

Answer 1

Answer:

Refractive index = 2

Explanation:

By the law of refraction $n = \frac{c}{v}$:

where n is the refractive index

c is the speed of light

v is the speed of light in a certain material

We know that the speed of light c is 3*10^8 m/s

$n = \frac{3e8}{3e8*0.5} = 2$