Q. 2

A certain material has refractive indices 1.56, 1.60 and 1.68 for red, yellow and violet light respectively. A Calculate the dispersive power. B Find the angular dispersion produced by a thin prism of angle 6 made of this material.

Answer :

Given that

Refractive index of red light = μr = 1.56

Refractive index of yellow light = μy = 1.60

Refractive index of violet light = μv = 1.68

Refracting angle of prism=A= 6.0°

A Dispersive power = ω =

= [substituting values]


B Angular dispersion = δ =




Thus, the angular dispersion produced by the thin prism is 0.72°

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