First slide

Dispersion

Question

If refractive index of red, violet and yellow lights are 1.42, 1.62 and 1.50 respectively for a medium. Its dispersive power will be

Moderate

A

0.4
B

0.3
C

0.2
D

0.1

Solution

$ω = \frac{μ_{V} - μ_{R}}{μ_{Y} - 1} = \frac{1 .62 - 1 .42}{1 .5 - 1} = 0 .4$

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