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
- A$\sqrt{\omega d} + \sqrt{\omega' d'} = 0$
- B$\omega' d + \omega d' = 0$
- C$\omega d + \omega' d' = 0$
- D$(\omega d)^2 + (\omega' d')^2 = 0$
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