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critical angle

From Wiktionary, the free dictionary

English

Noun

critical angle (plural critical angles)

  1. (optics) The angle of incidence beyond which light traveling through a medium experiences total internal reflection upon encountering a boundary with a less refractive medium.
  2. (aviation) The angle of attack beyond which an airfoil stalls, experiencing a decrease in lift and increase in drag due to separation of airflow from the upper surface of the airfoil.
  3. (architecture) The angle beyond which a ramp or a set of stairs is considered uncomfortable or unsafe.

Synonyms

(angle of attack):

Translations

See also

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