define angular dispersion and dispeesive power
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ANGULAR DISPERSION :
The angular dispersion is defined as angle between the two extreme colours of light (i.e. violet and red colours).
DISPERSIVE POWER :
power of a transparent medium to separate different colors of light by refraction as measured by the difference in refractivity for two specified widely differing wavelengths divided by the refractivity at some specified intermediate wavelength.
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