Friday, October 8, 2010

Blue Sky

The blue colour of the sky is due to the scattering of the sun’s light by molecules in the atmosphere. Known as the Tyndall effect or Tyndall scattering, is light scattering by particles in a colloid or particles in a fine suspension.






 As per theTyndall effect the shorter the light’s wavelengths, the more strongly it is reflected and scattered by these molecules. It is named after the 19th century physicist John Tyndall. He was the first to successfully answer the question “Why is the sky blue?”



Color receptors in the retina of the human eye are most responsive to wavelengths of red, green, and blue light. The wavelengths of blue light are shorter than those of both red and green light – therefore, the sky appears blue to the human eye.



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