00:01
Okay, in this problem we're asked to find the speed of light, i should say v, in ethyl alcohol, lusite, and crown glass.
00:10
So we have these different media.
00:12
We know that the speed of light decreases when it's not in vacuum, and the amount that it decreases depends on the index of refraction for that particular material.
00:22
The equation we're going to be making use of three times is that the speed of light in some medium, and that's not just free space, is the speed of light in vacuum, c, over n, the index of refraction, for the different materials.
00:35
So it just so happens that for, i'm going to call these cases a, b, and c.
00:39
For part a, we have an index of fraction of 1 .36...