The focal lengths of a converging lens for red, yellow and violet light are 100 cm, 98 cm and 96 cm respectively. Find the approximate dispersive power of the material of the lens.

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Solution

The correct option is B
0.04

$ω = \frac{\frac{1}{f_{v}} - \frac{1}{f_{R}}}{\frac{1}{f_{y}}} = 0.041$

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The focal lengths of a converging lens for red, yellow and violet light are 100 cm, 98 cm and 96 cm respectively. Find the approximate dispersive power of the material of the lens.

The correct option is B 0.04 ω=1fv−1fR1fy=0.041

The correct option is B
0.04

$ω = \frac{\frac{1}{f_{v}} - \frac{1}{f_{R}}}{\frac{1}{f_{y}}} = 0.041$