00:01
So we're told that some light enters a crown glass from air.
00:04
So the index of refraction of the medium that's coming from, i call it n sub 1, is 1 for the index of refraction of air.
00:11
And the angle of incident is theta 1, which is 60 degrees.
00:14
And the index of refraction, we're told of the red light, which i call into r.
00:21
So that's the index of refraction of the second medium, r for red, is 1 .512.
00:25
And the index of refraction for violet light into v is 1 .53.
00:31
So using that, it wants us to find the angle of refraction for both cases.
00:35
So we're going to use snell's law, which says that n1 times, let's re -write this over here.
00:44
So snell's law says n1 times the sign of the incident angle, theta 1, is equal to n2, times the sign of the incident angle, theta 1, is equal to n2, times the sign of, of the angle of refraction theta 2, which is what we're trying to find in both cases.
01:03
So for part a, solving for theta 2, here we find that this is equal to the inverse sign, which we write here as sine of the minus 1, of the ratio of n1 times the sine of theta 1.
01:22
And then for the first case, this is the, i wrote theta 2, that's supposed to be theta 1 here...