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| Dispersion of Light |
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| It is the phenomenon of splitting of a beam of white light into its constituent colors on passing through prism. The order of colors from the lower end are violet, indigo, blue, green, yellow, orange and red. |
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The refractive index of prism depends on wavelength according to
cauchys relation namely  . Since different colors of light
have different wavelength, their m's are also different. Now red light has a longer wavelength than violet and so mred < mviolet. This means the dv > dr that is violet deviates by a larger angle than red light. All colors having wavelength is between red and violet deviate through intermediate angles leading to formation of a colored spectrum. |
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