Two incident monochromatic waves whose wavele | vedclass

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(B) The angular dispersion is the difference in the angles of deviation for the two wavelengths,which is $(	heta + d	heta) - 	heta = d	heta$.The c

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$d	heta / d\lambda$

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(B) The angular dispersion is the difference in the angles of deviation for the two wavelengths,which is $(	heta + d	heta) - 	heta = d	heta$.The change in wavelength is given as $d\lambda$.The dispersive power $\omega$ of a medium or prism is defined as the ratio of the angular dispersion produced by the two wavelengths to the deviation of the mean ray.Mathematically,$\omega = \frac{	ext{Angular dispersion}}{	ext{Deviation in mean ray}} = \frac{d	heta}{d\lambda}$.

Two incident monochromatic waves whose wavelengths differ by a small amount $d\lambda$ are separated angularly at $\theta$ and $\theta + d\theta$ with respect to the incident ray. The dispersive power is given by

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