First slide

Dispersion

Question

For a material, the refractive indices for red, violet and yellow colour light are respectively 1.52, 1.64 and 1.60. The dispersive power of the material is

Moderate

A

2
B

0.45
C

0.2
D

0.045

Solution

$ω = \frac{1 .64 - 1 .52}{1 .6 - 1} = \frac{0 .12}{0 .6} = 0 .2$

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