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

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(C) The dispersive power $\omega$ is defined as the ratio of angular dispersion $\theta$ to the mean angular deviation $d$ (or $\delta_y$): $\omega = \frac{\theta}{d}$.Thus,the angular dispersion for a prism is given by $\theta = \omega d$.For two prisms combined,the condition for 'deviation without dispersion' is that the net angular dispersion must be zero.Therefore,$\theta_1 + \theta_2 = 0$.Substituting the expression for angular dispersion,we get $\omega d + \omega' d' = 0$.

Class 11 Chemistry Data Entry - Chemistry Level 0 of all question bank

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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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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