Question

how does reflection take place in the atmosphere​

Answer 1

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Since the atmosphere consists of varying densities the apparent position of the object, as seen through the hot air fluctuates. This wavering of light is an effect on atmospheric refraction.

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Answer 2

Explanation:

when light from any object in outerspace pass through the different layers of atmosphere it refracts because the different layers consist of gases in different amount and the layers vary in density with each other.