First slide

Dispersion

Question

If the refractive indices of a prism for red, yellow and violet colours be 1.61, 1.63 and 1.65 respectively, then the dispersive power of the prism will be

Moderate

A

$\frac{1 .65 - 1 .62}{1 .61 - 1}$
B

$\frac{1 .62 - 1 .61}{1 .65 - 1}$
C

$\frac{1 .65 - 1 .61}{1 .63 - 1}$
D

$\frac{1 .65 - 1 .63}{1 .61 - 1}$

Solution

$ω = \frac{μ_{V} - μ_{R}}{μ_{Y} - 1} = \frac{1 .65 - 1 .61}{1 .63 - 1}$

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