Three thin prisms are combined as shown ...

Three thin prisms are combined as shown in figure . The refractive indices of the crown glass for red , yellow and violet rays are `mu_r,mu_yand mu_v` respectively and those for the flint glass are `mu_r',mu_y'and mu_v'` respectively . Find the ratio `(A')/A` for which , there is no net angular dispersion (A and A' are respective deviations )

`(mu_y-1)/(mu_y-1)`

`(2(mu_v-mu_r))/((mu'_v-mu'r))`

`(mu_v-mu_r)/(mu'_v-mu'_r)`

`(2(mu_y-1))/((mu'_y-1))`

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