Mathematically, this can be written as:
\[\frac{\sin i}{\sin r} = \frac{n_b}{n_a}\]
where \(i\) is the angle of incidence, \(r\) is the angle of refraction, \(n_a\) is the refractive index of medium a, and \(n_b\) is the refractive index of medium b.
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