Not exactly, the angle of refraction = the angle of incidence, which means the ratio of sine of angle of incidence to the sine of angle of refraction is constant for two media.
That is sin i /sin r = constant , and this constant is called refractive index
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No.
Usually not.
The angle of incidence
The law of reflection states that the angle of incidence is equal to the angle of REFLECTION. Refraction is an entirely different phenomenon and has its own law.
You can use Snell's Law. Note that you need two angles for this - the incoming angle, and the outgoing angle.