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Dispersive Power #8211; The dispersive power of a prism material is measured by the ratio of angular dispersion to the mean deviation suffered by light beam. ∴ Dispersive power, [ω = δ<sub>V</sub> #8211; δ<sub>R</sub>/δ<sub>γ</sub> = μ<sub>V</sub> #8211; μ<sub>R</sub>/μ #8211; 1 where, μ = μ<sub>Y</sub> = Mean refractive index
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