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Explain the phenomenon of dispersion of white light through a glass prism, using a suitable ray diagram.

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  • When ray of light enters a prism, it bends because of refraction of light.
  • When the ray of light finally emerges out of the prism. 
  • It deviates drastically from its original path. 
  • This happens because of unique shape of prism. 
  • Different colours in the visible spectrum have different speeds. 
  • Due to this, different colours bend at different angles of deviation. 
  • As a result, the emergent light appears as a band of seven colours.
  • The colours which are the components of white light. 
  • These colours are Violet. Indigo, Blue, Green, Yellow, Orange and Red.
  • Segregation of white light into its different components is called dispersion of light.

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