HyperDic: critical_angle

English > 1 sense of the expression *critical angle*:
NOUN	shape	critical angle	the smallest angle of incidence for which light is totally reflected

English > *critical angle*: 1 sense > noun 1, shape
Meaning	The smallest angle of incidence for which light is totally reflected.
Broader	angle of incidence, incidence angle	The angle that a line makes with a line perpendicular to the surface at the point of incidence