Answer:
[tex]n=\frac{c}{v}[/tex]
Explanation:
The index of refraction of a material is defined as:
[tex]n=\frac{c}{v}[/tex]
where
c is the speed of light in vacuum
v is the speed of light in the material
The speed of light in the material, v, is always smaller than the speed of light in vacuum, c: therefore, this ratio is always greater than 1. The index of refraction basically tells how much is the light slowed down in a material: the greater the value of the index of refraction, the slower light travels in that medium.
