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InterviewSolution
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What is scattering of light ? Use this phenomenon to explain why (i) the sun appears reddish at sunrise, and (ii) the clear sky appears blue. |
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Answer» Solution :SCATTERING of light is the phenomenon of spreading of light in all DIRECTIONS due to interplay of light with tiny particles like air molecules, dust particles, colloidal solutions etc. (i) At the time of sunrise the sun is situated near the HORIZON. Light from sun THEREFORE covers a larger distance in the earth.s atmosphere before REACHING an observer.s eyes. During its passage through atmosphere blue light is mostly scattered away and so the sun appear reddish. (ii) During day time light from sun is scattered from air molecules in all directions. The amount of scattering is more for blue light because its wavelength is less. Hence, the clear sky appears blue. |
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