00:01
The diagram given in the question is, θ1 is angle of reflection while θ2 is angle of refraction.
00:37
Therefore, from the figure, the reflected and refracted rays are perpendicular to each other.
01:16
An g is refractive index of glass and an air is refractive index of air.
01:43
So, the θ1 and θ2 are related by θ1 plus 90 degree plus θ2 is equal to 180 degree.
02:07
Therefore, θ1 plus θ2 is equal to 180 degree minus 90 degree.
02:15
Therefore, θ1 plus θ2 is equal to 90 degree.
02:21
Therefore, θ2 is equal to 90 degree minus θ1.
02:29
Then, from snell's law, an air into sin θ1 is equal to an g into sin θ2.
02:50
Therefore, substituting the value of θ2, therefore, an air into sin θ1 is equal to an g into sin 90 minus θ1...