Question

define angular and dispersive power....

Answer 1

The ability of a prism material to disperse the light rays is measured with dispersive power. It is defined as the ratio of angular disposition between red and violet colors to the main deviation of the colors. ...Dispersive power is independent ofangle of incidence but depends on the nature of the material.

Answer 2

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The angular dispersion is defined as angle between the two extreme colours of light . Dispersive power of a prism is defined as the ratio of angular dispersion to the deviation of mean colour.

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