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Total Internal Reflection
The phenomenon due to which a ray of light, while traveling from optically denser medium to optically rarer medium, gets reflected into optically denser medium, at the surface of separation.
For total internal reflection:
(i) rays of light must travel from optically denser medium to optically rarer medium
(ii) the angle of incidence in optically denser medium, must be greater than critical angle.
Angle of incidence in a denser in a denser medium for which angle of refraction in rarer medium is 90 degree is called critical angle.
(i) rays of light must travel from optically denser medium to optically rarer medium
(ii) the angle of incidence in optically denser medium, must be greater than critical angle.