Class 10 Physics Human Eye and Colourful World Tyndall Effect

Tyndall Effect

  • The earth's atmosphere is a mixture of many minute particles such as smoke, water droplets, dust etc. When a beam of light strikes these fine particles, the path taken by that beam becomes visible. Light gets reflected continuously by these particles and then reaches us.
  • This phenomenon of scattering of light by particles is the Tyndall effect.
  • Tyndall effects explain why we see the sky as blue, forests as green and so on.

Why  does the Sky appear clear blue?

  • The air molecules and other fine particles have sizes smaller than the wavelength of visible light.
  • Such particles scatter light of shorter wavelengths ie blue more effectively than longer wavelengths( red)
  • When sunlight passes through the atmosphere, the blue end of the spectrum is scattered more.
  • This enters our eyes and hence we see the sky as blue

 

 

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