Physics
Even after sunset, the air near the Earth's surface continue to receive heat due to

Conduction
Convection
Terrestrial Radiation
Insolation

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Physics
What is refractive index ?

None of above
It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

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