Hotter air : refractive index : : cooler air : _ refractive index

High, low

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Fluctuating, constant

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Constant, fluctuating

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Low, high

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Solution

The correct option is D Low, high
Hot air is lighter than cool air and hence is less dense. It has refractive index slightly less than that of cool air. Since the physical conditions of the refracting medium (air) are not stationary, the apparent position of the object seems to fluctuate when seen through hot air. This wavering is an effect of atmospheric refraction.

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Hotter air : ____ refractive index : : cooler air : _____ refractive index

Hotter air : refractive index : : cooler air : _ refractive index