Discussion
Assertion (A): The setting sun appears red for the same reason the sky appears blue.
Reason (R): The long path length removes the short wavelengths by scattering before the light arrives.
Answer: A
Both are true and the reason gives the mechanism, and only the longer wavelengths survive the journey. One phenomenon is the complement of the other. Path length through the atmosphere decides which. Low sun means a long path and a red result.
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