First slide

Dispersion

Question

The focal lengths of convex lens for red and blue light are 100 cm and 96.8 cm respectively. The dispersive power of material of lens is

Moderate

A

0.325
B

0.0325
C

0.98
D

0.968

Solution

$ω = \frac{f_{R} - f_{V}}{f_{y}} = \frac{f_{R} - f_{V}}{\sqrt{f_{V} f_{R}}} Putting value of f_{V} and f_{R} we get ω = 0 .0325$

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