Question

atmospheric refraction refers to refraction of light by
A) An atmospheric layer of constant refractive index
B) Atmospheric constant of different refractive indices
C) Air of refractive index 1
D) Air of refractive index less than 1

Answer 1

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• B) Atmospheric layers of different refractive indices.

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• When the light passes through different layers of atmosphere, refraction takes place.
• The atmosphere contains different layers which have different/varying refractive indices.
• Hence, different amount of refraction takes place through each atmospheric layer.
• The layers keep on getting rarer as we go up. So, light while coming from the sun keep on undergoing refraction.
• This is known as atmospheric refraction

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hope it's helpful :"D