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If the refractive indices of crown glass for red, yellow and violet colours are $1.5140,1.5170$ and 1.5318 respectively and for flint glass these are $1.6434,1.6499$ and 1.6852 respectively, then the dispersive powers for crown and flint glass are respectively
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0.034 and 0.064
The dispersive power for crown glass $\omega=\frac{n_v-n_r}{n_y-1}$
$=\frac{1.5318-1.5140}{(1.5170-1)}=\frac{0.0178}{0.5170}=0.034$
and for flint glass $\omega^{\prime}=\frac{1.6852-1.6434}{(1.6499-1)}=0.064$
$=\frac{1.5318-1.5140}{(1.5170-1)}=\frac{0.0178}{0.5170}=0.034$
and for flint glass $\omega^{\prime}=\frac{1.6852-1.6434}{(1.6499-1)}=0.064$
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