Pls explain me refraction trough pism

when light is refracted through prism it disperse into constituent colours

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 Whn white light passes through a prisim it nor only diviates from its original direction of propagation but also splits up into 7 constitutent colours....this happens because whn white lite travels in air or vacuum all the 7 constitutent colours travel at same speed . The colours remain together and therfore the light appears white. But whn it is incident on a prism all d different colours travel at different speeds and are refracted or deviated by different angles. D diveation is max for violet colour lite and minimum for red colour light..

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WHEN LIGHT IS PASSED THROUGH THE PRISM ITIS WHITE COLOUR AND AFTER PASSING IT SPLITS IN 7 COLOUR OR BAND OF COLOUR KNOWN AS SPECTRUM

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