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A certain material has refractive indice...

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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The correct Answer is:
(a) `(1)/(4) = 0.25` (b) `0.90^(@)`
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