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

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Answer 1 · 2018-04-01T14:49:35

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

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,

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

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

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