On hot days, the air close to the ground has a refractive index the air above.

lower than

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higher than

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equal to

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Solution

The correct option is A lower than
During hot days, the ground becomes very hot. As a result, the air close to the ground is hotter and rarer than the air above. Thus, its refractive index is lower than the air above.

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On hot days, the air close to the ground has a refractive index the air above.

The correct option is A lower thanDuring hot days, the ground becomes very hot. As a result, the air close to the ground is hotter and rarer than the air above. Thus, its refractive index is lower than the air above.

The correct option is A lower than
During hot days, the ground becomes very hot. As a result, the air close to the ground is hotter and rarer than the air above. Thus, its refractive index is lower than the air above.