00:01
Okay, in this question, you have a ray of light that is going between or going from the air through coating, a plastic coating, and then into the glass.
00:13
And they tell us that the angle of incidence at this boundary right here is 12 degrees.
00:19
And they give us information about the speed of light within those two mediums.
00:24
So we're going to use snell's law, but we're going to set up our index of refraction with respect to the speed of light.
00:30
So the index of refraction through the coding would be the speed of light divided by the speed of the light ray within that medium.
00:44
And then for the glass, same thing, the speed of light, divided by the speed of light within that medium.
00:55
And we use these within snell's law.
00:59
So we're going to set this up like this, sine theta 1, and c over v2, sine theta 2.
01:12
And c is the variable used to represent the speed of light in a vacuum.
01:17
So just for reference, that's 3 times 10 to the 8.
01:26
Let's back up a little bit here...