First slide

Dispersion

Question

For a medium, refractive indices for violet, red and yellow are 1.62, 1.52 and 1.55 respectively, then dispersive power of medium will be

Moderate

A

0.65
B

0.22
C

0.18
D

0.02

Solution

$ω = \frac{μ_{v} - μ_{R}}{μ_{y} - 1} = \frac{1 .62 - 1 .52}{1 .55 - 1} = 0 .18$

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