00:01
Alright so interestingly the refractive index of this material, you know, because we are given that the angle there is 42 .1 degrees correct? so the index, i'm going to have to call that the index of the refractive, the refraction of the material rather, will be equal to 1 divided by that angle.
00:24
So looking at the reciprocal of the angle and that index is 1 .49.
00:32
Now this material with a refractive index of 1 .49 has this another incidence of, angle of incidence as 37 .4.
00:46
This is part a.
00:47
Alright so part b, for us to get the angle, the other angle, that the refractive ray, the angle of the reflected ray rather, alright? so therefore, we take the index of the air, you know, multiply that by the sine of the angle, alright? which will be equal to the index of the material multiplied by sine of r, ok? that is the reflected ray...