Question

What's total internal reflection?

Answer 1

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Total internal reflection is the phenomenon which occurs when a propagated wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface

. The critical angle is the angle of incidence above which the total internal reflection occurs.


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Answer 2

The complete reflection of light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle.
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