The rate of sine of the angle of incidence to the angle of refraction (r) is a constant called refractive index
i.e. 
.
For two media, Snell's law an be written as 
When a light wave goes from a rarer phase to a denser medium, it bends towards the normal.
When a light wave goes from a denser medium to a rarer medium, it bends away from the normal.
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