Question

what is mean by scattering of light the sky appears blue and sun appears reddish at sunrise and sunset explain explain this phenomenon with reason

Answer 1

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colors because the blue light has been scattered out and away from the line of sight.

Sunlight consists of seven colors. Of these, red has the maximum 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 is mostly scattered away.

Answer 2

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Scattering of light—Phenomenon of spreading of light (diffused reflection) by minute particles  in a medium.

(ii) The sky appears blue because the blue colour of sunlight scatters much more strongly than the  red colour by particles in atmosphere/air due to its shorter wavelength.

(iii) At sun-rise and sun-set most of the blue light and shorter wavelengths are scattered away by  the particles in the atmosphere as the light from the sun near the horizon passes through thick  layers of air and larger distance.

The light that reaches us is of longer wavelength (red colour)  giving a reddish appearance.

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