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Snell's Law
(eq (/ n_1 n_2)
(/ (sin Omega_2)
(sin Omega_1)))
(Omega_1 "angle from boundry for first medium")
(Omega_2 "angle from boundry for second medium")
(n_1 "index of refaction of first medium")
(n_2 "index of refaction of second medium")
good example is the 22 degree halo: Ice (n=1.31), two refractions from 60
degree prism (hexagonal ice crystal)
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