The critical angle Oc is defined as the angle of incidence at which angle of refraction is ....
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The critical angle Oc is defined as the angle of incidence at which the angle of refraction is 90 degrees.
It is the greatest angle at which a ray of light, travelling in one transparent medium, can strike the boundary between that medium and a second of the lower refractive index without being totally reflected within the first medium.
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