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Question

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
  1. Dispersion of light
  2. Total internal reflection of light
  3. Scattering of light
  4. Reflection of light from the earth

A
Dispersion of light
B
Reflection of light from the earth
C
Scattering of light
D
Total internal reflection of light
Solution
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We see red colour of the sun at sunrise or sunset as the sun at horizon and light rays need to travel a greater distance. In the process of scattering, violet, blue and green rays in the original sunlight are removed and the transmitted beam has yellow and red dominant.

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