Which one has the higher refractive index, cooler air or hotter air?

hotter

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cooler

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same for both

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cannot be determined.

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Solution

The correct option is B
cooler

Since hotter air is less dense than cooler air, hence the refractive index of the hotter air is less than the cooler air.

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Which one has the higher refractive index, cooler air or hotter air?

The correct option is B cooler Since hotter air is less dense than cooler air, hence the refractive index of the hotter air is less than the cooler air.

The correct option is B
cooler

Since hotter air is less dense than cooler air, hence the refractive index of the hotter air is less than the cooler air.