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White light its passed through a prism of `5^@`. If refractive indices for red and blue rays are `1.641 and 1.659` respectively, calculate the angular dispersion of the prism.

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Here `A = 5^@, mu_r = 1.641, mu_b = 1.659`
Angular dispersion `= (mu_b - mu_r) A`
=`(1.659 - 1.641) xx 5^@`
=`0.09^@`.
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