00:01
So here we have a ray of light traveling through air, and we are given its angle of incidence with a piece of glass.
00:07
We are asked how far does the ray travel inside the glass before emerging through? and we want our answer in centimeters.
00:15
So first, let's do a sketch of our, i guess, what our light ray is going through.
00:21
So we can say that our light ray, i'll make it red, this sort of path.
00:30
And so we're going to say this is our medium one.
00:33
That m1, or excuse me, n1, which is the air.
00:37
And our angle of incidence, i'm going to call theta 1.
00:43
Theta 1, and theta 1 is given our problem.
00:46
We'll say that is 45 degrees.
00:50
We are given the thickness of our glass, and that is 1 .7 centimeters.
00:57
So we're at 1 .7.
01:00
And we're going to have a theta 2, and this data 2 will depend on the path of our light ray as it goes through a medium.
01:12
So suppose that it travels a distance that looks, i'm going to make it blue, something like this.
01:21
And so it's not quite, there's probably a bit more clear.
01:28
So we're going to call this distance from here to here.
01:34
So the sort of diagonal in which the light takes its path.
01:38
So we want to note that our medium, the glass, is n2...