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The refractive indices of flint glass prism for violet, Yellow and Red colours are 1.790, 1.795 and 1.805 respectively, find dispersive power of the flint glass.

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`mu_(v) = 1.790 , mu_(Y) = 1.795` and `mu_(R) = 1.805`
`omega = (mu_(v) - mu_(R))/(mu_(Y) - 1) = (0.015)/(0.795) = 0.01887`

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