define angular dispersion and dispersive power.
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Hint: Dispersion is known as the phenomenon of splitting of white light into its constituent colours. ... The dispersive power of the material of a prism is defined as the ratio of angular dispersion for any two wavelengths to the deviation of mean wavelength.
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Angular Dispersion is defined as the difference in the angles of deviation of two extreme colours of the spectrum of white light.
Dispersive power can be defined as the ability (power) of a transparent medium to disperse (refract) the light rays. We can write the formula of dispersive power in terms of refractive index, by taking the example of a glass prism.
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