Definitions from Wiktionary (critical angle)

▸ noun:  (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.
▸ noun:  (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.
▸ noun:  (architecture) The angle beyond which a ramp or a set of stairs is considered uncomfortable or unsafe.
▸ Also see critical_angle


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