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The refractive indicates of flint glass ...

The refractive indicates of flint glass for red and violent colours are `1.644 "and" 1.664`. Calculate its dispersive power.

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Here , `mu_(r) = 1.644, mu_(v) = 1.664, omega = ?`
Now `mu_(y) = (mu_(v) + mu_(r))/(2) = (1.664+1.644)/(2) = 1.654 " " because omega = (mu_(v) - mu_(r))/(mu_(y) - 1) = (1.664-1644)/(1654-1) = 0.0305`
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