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Question

In a prism, the refractive indices of different colours are
$μ_{V} =$ 1.6;
$μ_{R} =$ 1.52;
$μ_{Y} =$ 1.56.
The dispersive power of the prism is :

A

$\frac{1}{5 6}$

B

$\frac{1}{8}$

C

$\frac{1}{7}$

D

Infinite

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Solution

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Correct option is C)

Dispersive power of prism= $w = \frac{μ _{V} - μ _{R}}{μ _{Y} - 1}$

$w = \frac{1 . 6 - 1 . 5 2}{1 . 5 6 - 1}$

$w = \frac{1}{7}$

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