What is total internal reflection ?

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Answer:-
When light travels from a denser medium to a rarer medium,the angle of refraction is greater than the angle of incidence.For certain angle of incidence called critical angle the angle of refraction becomes 90°. When angle of incidence in the denser medium exceeds critical angle,the ray gets reflected back into the denser medium.This is called total internal reflection.
In given figure medium 1 is denser than medium 2
What is total internal reflection ?

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