What is the reason for the apparent flattering of the sun’s disc at sunset and sunrise?

Atmospheric refraction

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Scattering

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tyndall effect

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Dispersion

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Solution

The correct option is A Atmospheric refraction
The apparent flattering of the sun’s disc at sunset and sunrise is due to atmospheric refraction. The density and refractive index of atmosphere keep changing so the rays emerging from the top and the bottom portion of the sun are refracted by different degrees. The rays from the side portion of the sun are refracted by the same degree so it appears circular along the sides.

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The apparent flattening of sun at sunrise and sunset is due to atmospheric refraction?

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