total internal reflectance, TIR

[7.3.4] Total reflection of a light ray at the boundary between two media, occurring when the angle of incidence in medium 2 exceeds the angle whose sine equals n1/n2 when the ray is propagating in the direction from medium 2 toward medium 1, and where n1 and n2 are indices of refraction for medium 1 and medium 2, respectively.

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