Assertion :The setting sun appears to be red. Reason: Scattering of light is directly proportional to the wavelength.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
It is due to the different wavelengths of light.
The red light wavelenghts are diffracted the least by the atmosphere. When the Sun is setting, the angle of the Sun to us becomes more and more shallow, so we see more of the wavelengths that were not diffracted much. This explains why the Sun gradually changes from yellow, becoming more and more orange before turning red.
The amount of scattered light is inversely proportional to the fourth power of light wavelength
i.e. $I \propto \frac{1}{λ^{4}}$

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