Does refraction change the direction of light when it passes from air to glass?
As long as the light strikes the glass with an angle of incidence greater than
As light passes from air (with a low index of refraction) to glass (with a higher index of refraction), it will slow down, which bends the light toward the normal.
If the light passes from glass to air, it will speed up, which bends the light away from the normal.
The angle of refraction can be calculated using Snell's Law (