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.

A certain material has refractive indices 1.56, 1.60 and 1.68 for red,

1.	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» SOLUTION :GIVEN that `mu_r=1.56,` `mu_y=1.60, and mu_c=1.68` a. Dispersive power `=omega` `=(mu_v-mu_r)/(mu_y-1)=(1.68-1.56)/(1.60-1)` `=0.12/0.60=0.2` B. ANGULAR dispersion `=(mu_r-mu_r)a` `=(0.12)xx6^@=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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