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A thin prism ...

Question

A thin prism produces deviations of ${5.04}^{o}, {5.31}^{o}$ and ${5.63}^{o}$ respectively for red, yellow and violet colours. Find the dispersive power of the prism.

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Solution

Dispersive power of prism,

$w = \frac{δ_{v} - δ_{r}}{δ}$

$= \frac{5.63 - 5.04}{5.31}$

$= 0.11$

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