Question

Light is travelling in quartz, which has an index of refraction of 1.458. How fast does light travel in quartz?

Answer 1

Approximately `2.06*10^8` meters per second.

Explanation:

Well, the equation for the refractive index is:

`n=c/v`

• `c` is the speed of light in a vacuum

• `v` is the speed of light through the medium

And so, we get,

`1.458=(3*10^8 \ "m/s")/v`

`v=(3*10^8 \ "m/s")/(1.458)`

`~~2.06*10^8 \ "m/s"`