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  4. At sunset or sunrise, the sun's rays have to pass through a larger distance because

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Q. At sunset or sunrise, the sun's rays have to pass through a larger distance because

Ray Optics and Optical Instruments

Solution:

At sunset or sunrise, the Sun's rays have to pass through a larger distance in the atmosphere. Most of the blue and other shorter wavelengths are removed by scattering. The least scattered light reaching our eyes, therefore, the Sun looks reddish. This explains the reddish appearance of the Sun and full Moon near the horizon.