total internal reflection takes place when light ray travels from
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Total internal reflection takes place when light travells from optically denser to optically rarer medium. The main criteria for total intal reflection is that angle of incidence should be greater than critical angle
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In general, total internal reflection takes place at the boundary between two transparent media when a ray of light in a medium of higher index of refraction approaches the other medium at an angle of incidence greater than the critical angle. For a water-air surface the critical angle is 48.5°.
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