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  • A certain material has refractive indices 1.56, 1.60 and 1.68 of red, yellow and violet lights respectively. If the apex angle of prism is 4o. Then calculate the dispersive power.<di

A certain material has refractive indices 1.56, 1.60 and 1.68 of red, yellow and violet lights respectively. If the apex angle of prism is 4o. Then calculate the dispersive power.

Option: 1

0.6


Option: 2

0.4


Option: 3

0.2


Option: 4

0.1


Answers (1)

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\begin{array}{l}{\omega=\frac{\mu_{v}-u_{r}}{\mu_{y}-1}} \\ \\ {\text { On substituting the values in the above formula, we get : }} \\ \\{\omega=\frac{(1.68-1.56)}{(1.60-1)}} \\ \\ {=\frac{0.12}{0.60}=0.2}\end{array}

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