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Why the sun looks red at the time of set...

Why the sun looks red at the time of setting ? Expain on the basic of colloidal properties.

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At the time of setting, the sun it is at horizon. The light emitted by the sun has to travel a longer distance through the atmosphere, As a result, blue part of the light is scattered away by the dust particles in the atomospher. Hence the red part is visible.
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