00:03
All right, so in this example, we have an earthquake that is traveling through the earth and hits a different type of medium.
00:11
And so in this scenario, we'll say like this is medium one and this is medium two.
00:17
So we're going to use a relation called snell's law.
00:20
So we have n1, sine theta 1 is equal to n2 sine of theta 2.
00:29
And so just drawing what this is going to look like.
00:33
So that's our incoming wave p.
00:37
And it's traveling in medium one, then it's hitting medium two, and then it's changing its direction.
00:45
And so incoming, we have a velocity one, which is eight.
00:50
We're trying to find velocity two.
00:53
And we have this thing called the ankle of instant, or the.
00:59
Yeah, angle of incidence.
01:01
And so that is going to be right here.
01:05
That's that theta 1.
01:06
And so theta 1 is going to be 44 degrees.
01:10
So that's the angle it's making with the vertical as the wave is incoming.
01:16
And then after is the angle of refraction, which is given to us as 33 degrees.
01:25
And so typically when you use snell's law, a lot of times, like it's the light index...