Question

The speed of light in a transparent medium is 0.6 times that of its speed in vacuum. Find the refractive index of the medium.

Answer 1

Refractive index is defined as

`\mu = (speed of light in air)/(speed of light in medium)`

`\mu = (c)/(v)`

given that

v = 0.6 c

so we will have

`\mu = (c)/(0.6c)`

`\mu = 1.67`

Answer 2

The refractive index is 1.66

Step-by-step explanation:

The speed of light in a transparent medium is 0.6 times that of its speed in vacuum .

Refractive index of medium = speed of light in vacuum / speed of light in medium

So

RI = 1/0.6 = 5/3 or 1.66