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It will form seven colours for example the case of rainbow when light falls on rain drop it will dispersed into 7 colours
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It will form an spectrum that are 7 colours . Newton showed that prism can produce a spectrum. He allowed a thin beam of light to form on prism in a dark room. After passing through the prism, the beam splits it into different colours . A spectrum forms when light falls on prism and disperse. Hope u understood well.
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