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In a certain spectrum produced by a glass prism of dispersive power `0.031`, it was found that `mu_r = 1.645 and mu_b = 1.665`. What is the refractive index for yellow colour ?

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`1.645`
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In a certain spectrum produced by a glass prism od dispersive power 0.031 , it was found that mu_(r ) = 1.645 and mu_(b) = 1.665 . What si the refractive index for yellow colour ?

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