For a total internal reflection, which of the following is correct?

Light travel from rarer to denser medium.

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Light travel from denser to rarer medium.

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Light travels in air only.

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Light travels in water only.

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Solution

The correct option is A Light travel from denser to rarer medium.
The total internal reflection occurs when the ray of light is reflected totally into the same medium even without the presence of a mirror. The total internal reflection occurs when a ray of light travels from denser medium to rarer medium.

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Total Internal reflection happens only when light is travelling from an optically denser medium to an optically rarer medium.

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