The angle of incidence does not change. I think you want to know the relationship between the angle of incidence and the angle of transmission. In the case of from air to glas, the transmission angle is smaller than the angle of incidence due to a higher index of refraction of glass than that of air. Look up Snell's Law for better understanding.
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It does not move from glass to air but undergoes internal refraction. That is, it is refracted back into the glass at the interface.
same problem dude..
Angle of incidence has to be 0. This means that the ray has to hit normally on the surface of separation of two media
Angle of refraction will be less compared to the angle of incidence in this case.
The angle of refraction is larger. BOOBIES