Scattering of Light and Atmospheric Optical Phenomena

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Multiple Choice

Which of the following statement is correct?

  1. At sunset or sunrise, the suns rays have to pass through a small distance in the atmosphere.
  2. At sunset or sunrise the suns rays have to pass through a larger distance in the atmosphere.
  3. Rayleigh scattering which is proportional to $(l/\lambda)^2$
  4. Most of the blue and other shorter wavelengths are not removed by scattering.
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