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Snell's law:
The ratio of the sines of the angles of incidence and refraction is equivalent to the ratio of velocities of waves in the two media, or equivalent to the reciprocal of the ratio of the refractive indices.

 \frac{sin\ \theta_1}{sin\ \theta_2} = \frac{v_1}{v_2} = \frac{n_2}{n_1}
\theta_1 = angle of incidence
\theta_2 = angle of refraction
v_1 = velocity of wave in incidence medium
v_2 = velocity of wave in refraction medium
n_1 = refractive index of incidence medium
n_2 = refractive index of refraction medium
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