Question

(a) The refractive index of Ruby is 1.71. What is meant by this statement?

Answer 1

This means that the ratio of speed of light in ruby to that of speed of light in vaccum is 1.71

I hope this will help u....

Answer 2

Explanation:

Refractive index: It is defined as the ratio of light travelling in a vacuum to its velocity travelling in a particular medium. It has no unit.

It measures the bending of a ray of light when the light travels from one medium to another medium.

The mathematically expression of refractive index is as follows as;

$n= \frac{c}{v}$

Here,c is the speed of light in vacuum, n is the refractive index and v is the speed of light in medium.

It is given in the problem that the refractive index of Ruby is 1.71. It means that the speed of light in vacuum is 1.71 times faster than that in medium.