In the visible region,the dispersive powers a | vedclass

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(C) The dispersive power $\omega$ is defined as the ratio of angular dispersion $	heta$ to the mean angular deviation $d$ (or $\delta_y$): $\omega =

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$\omega d + \omega' d' = 0$

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(C) The dispersive power $\omega$ is defined as the ratio of angular dispersion $	heta$ to the mean angular deviation $d$ (or $\delta_y$): $\omega = \frac{	heta}{d}$.Thus,the angular dispersion for a prism is given by $	heta = \omega d$.For two prisms combined,the condition for 'deviation without dispersion' is that the net angular dispersion must be zero.Therefore,$	heta_1 + 	heta_2 = 0$.Substituting the expression for angular dispersion,we get $\omega d + \omega' d' = 0$.

In the visible region,the dispersive powers and the mean angular deviations for crown and flint glass prisms are $\omega, \omega'$ and $d, d'$ respectively. The condition for getting deviation without dispersion when the two prisms are combined is

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