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(A) The dispersive power $(\omega)$ of a material is defined as the ratio of the angular dispersion to the mean deviation produced by a prism. Mathema

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Flint glass

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(A) The dispersive power $(\omega)$ of a material is defined as the ratio of the angular dispersion to the mean deviation produced by a prism. Mathematically,it is given by $\omega = \frac{\mu_v - \mu_r}{\mu - 1}$,where $\mu_v, \mu_r$ are refractive indices for violet and red light,and $\mu$ is the mean refractive index. Flint glass has a higher refractive index and a greater difference between the refractive indices of extreme colors compared to crown glass. Therefore,the dispersive power of flint glass is higher than that of crown glass.

The dispersive power is maximum for the material

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