The cold air layers of the atmosphere behave as optically

Either inactive or rarer medium

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Rarer medium

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Denser medium

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Inactive medium

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Solution

The correct option is C
Denser medium

The cold air layers of the atmosphere behave as optically denser medium for the light rays whereas warmer air layer acts as rarer medium for the light rays.

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Total internal reflection of a ray of light is possible when the ( $i_{c}$ = critical angle, $i$ = angle of incidence)

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