Total Internal Reflection Definition

noun

(optics, uncountable) A phenomenon where light, instead of passing into a medium of a lower refractive index and refracting away from the normal, is completely reflected by the boundary between the two media because it approaches at an angle greater than or equal to the critical angle.

Wiktionary
(countable) An instance of this phenomenon.
Wiktionary

Other Word Forms of Total Internal Reflection

Noun

Singular:
total internal reflection
Plural:
total-internal-reflections

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