Last modified on 16 December 2014, at 00:07

critical angle

EnglishEdit

Refraction internal reflection diagram.svg

NounEdit

critical angle (plural critical angles)

  1. (physics) The smallest angle of incidence for which light is totally reflected from a boundary between one medium and a less refractive one
  2. (aerodynamics) The smallest angle of attack of an airfoil at which lift suddenly decreases and drag suddenly increases
  3. (architecture) The smallest angle of a ramp or stairs considered uncomfortable or unsafe

See alsoEdit