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 = μ_{r} = 1.56

Refractive index of yellow light = μ_{y} = 1.60

Refractive index of violet light = μ_{v} = 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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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.

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