Meaning Of The Word Critical angle

Real Dictionary
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Critical angle Meaning

Critical angle Definition
Critical angle Definition

What's The Definition Of Critical angle?

critical angle in American English
the smallest possible angle of incidence at which light rays are totally reflected
noun: the minimum angle of incidence beyond which total internal reflection occurs for light traveling from a medium of higher to one of lower index of refraction; the angle of incidence for which refracted rays emerge tangent to the surface separating two medi

critical angle in British English
noun: the smallest possible angle of incidence for which light rays are totally reflected at an interface between substances of different refractive index

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