total internal reflection (TIR)

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[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, the ratio of indices of refraction when the ray is propagating in the direction from medium 2 toward medium 1.

NOTE: This term was changed in RP-16-17 Addendum 4.
Previous name: total internal reflectance, TIR

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