Light is travelling in water, which has an index of refraction of 1.333. How fast does light travel in water?

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Answer 1 · 2018-04-04T09:56:20

$2.25*10^8 \ "m/s"$

We use the refractive index equation, which states that

$n=c/v$

$c$ is the speed of light in a vacuum

$v$ is the speed of light through the medium

An dso,

$1.333=(3*10^8 \ "m/s")/v$

$v=(3*10^8 \ "m/s")/1.333$

$~~2.25*10^8 \ "m/s"$