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When the light travels from denser to rearer medium angle of incidence is grater than critical angle it reflects into the same medium.this is ccalled total internal reflection.
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Total internal reflection is a phenomenon that occurs when light travels from a more optically dense medium (or a medium with higher refractive index ) to a less optically dense one (lower index ), such as glass to air or water to air.

Total internal reflection is the operating principle of optical fibres, which are used in endoscopes and telecommunications. Total internal reflection is the operating principle of automotive rain sensors, which control automatic windscreen/windshield wipers.
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