SnellsLaw:

Path: Imaging/Optics

% Apply the vector form of Snell's law of refraction.
   This can work with 2 or 3 dimensional rays.
   The refracted ray is in the same direction as the incoming ray.
   It returns t = [0;0;0] for total internal reflection.

   Type SnellsLaw for a demo.
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   Form:
   t = SnellsLaw( n, i, mu )
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   ------
   Inputs
   ------
   n               (3,1) Normal
   i               (3,1) Incoming ray
   mu              (1,1) n1/n2

   -------
   Outputs
   -------
   t               (3,1) Refracted ray

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   Reference: Hanrahan, P. "Refraction"
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Children:

Math: Linear/Unit

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