Question

what is total internal reflection ​

Answer 1

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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Answer 2

when the angle of incidence in a denser medium is more than a critical angle ,the light reflects back to the denser medium this is called as total internal reflection