HyperDic: critical_angle

English > 1 sense of the expression critical angle:
NOUNshapecritical anglethe smallest angle of incidence for which light is totally reflected
English > critical angle: 1 sense > noun 1, shape
MeaningThe smallest angle of incidence for which light is totally reflected.
Broaderangle of incidence, incidence angleThe angle that a line makes with a line perpendicular to the surface at the point of incidence

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