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CBSE Class 10 Answered

Why do we see Vibgyor after the dispersion of white light?
Asked by mehaksri2001 | 29 Dec, 2016, 12:23: AM
answered-by-expert Expert Answer
  • Dispersion is the splitting up of white light into seven colors on passing through a transparent medium like a glass prism. When a white light beam is passed through a prism, a band of seven colors are formed is known as spectrum of white light.The seven colors in the spectrum are red, orange, yellow, green, blue, indigo and violet respectively.
  • The formation of spectrum of seven colors shows that white light is a mixture of seven colors (or seven colored light). The effect of transparent medium (like glass prism) is only to separate the seven colors of white light.
  • So, when white light consisting  of seven colors falls on a transparent medium (glass prism) , each color in it is refracted ( or deviated ) by a different angle , with the result that seven colors are spread out to form a spectrum, The red color is deviated least , so it forms the upper part of the spectrum . On the other hand, Violet color is deviated the maximum, so violet appears at the bottom of the spectrum.
  • Violet colour suffers the maximum deviation and red the least. The spectrum obtained is impure as the colours in the spectrum do not have any sharp boundaries i.e., each colour merges gradually into the next.
Answered by Abhijeet Mishra | 31 Dec, 2016, 09:35: PM

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