00:01
Okay, so in your problem, you have rays of sun coming from the air into water.
00:07
You're going to be using the snow to figure out what angle the sun makes with the horizon.
00:13
But snalls law deals with the angles made with the normal or the vertical.
00:18
And so it says raise of the sun are seen to make a 36 degree angle to the vertical beneath the water.
00:26
And so theta 2, this is our 36 degrees.
00:32
Things that your problem didn't give you that your book might is the index of refraction in air.
00:38
So n1 is one, but in water.
00:42
And two, the index of refraction is 1 .33.
00:46
And so when we use smell spa, i'm going to come over here and i'm going to say one times the sign of theta 1.
00:54
I still don't know that angle, but i know that these two angles make a 90 degrees.
00:58
So if i can find this one, i can find the angle that the sun makes with the horizon.
01:04
And then n2 is 1 .33 times the sign of 36.
01:12
So one times the sign of my angle is just the sign of my angle.
01:18
I'm going to simplify on this side...