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Physical phenomena

A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.


  • Overview 

  • Visibility 

  • Number of colours in spectrum or rainbow 

  • Explanation 

  • Variations 

  • Scientific history 

  • Culture 

  • Image gallery