Geometrical optics and ray tracing
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Refraction and reflection at a boundary
- The Snell-Descartes law or law of refraction stipulates that
- $ n_i sin\theta_i = n_t sin\theta_t $
with $ \theta $ the angle measured from the normal of the boundary, $ n $ the refractive index (which is unitless) of the medium, the subscripts $ i $ and $ t $ referring to the incident and transmitted light, respectively.