explain total internal reflection
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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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The total internal reflection of light in a medium of higher refractive index when it is incident on the boundary with another medium of lower refractive index at an angle greater than the critical angle is called TIR
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