(A) : The sun looks reddish at the time of sunrise
and sunset because of dispersion of light.
(R) : The wavelength of red colour is less than
the wavelength of blue colour.

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Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A

A' is true and 'R' is false

Both 'A' and ‘R’ are false

answer is C.

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Detailed Solution

Sunlight consists of seven colours; violet, indigo, blue, green, yellow, orange and red.
Among all these seven colours, red colour has the maximum wavelength whereas, violet has the shortest wavelength.
During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other than red having shorter wavelengths is mostly scattered away.
Most of the red light, which is the least scattered, enters our eyes. Hence, the sun and the sky appear red.

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