First slide

Dispersion

Question

A parallel beam of white light falls on a convex lens. Images of blue, yellow and red light are formed on other side of the lens at a distance of 0.20 m, 0.205 m and 0.214 m respectively. The dispersive power of the material of the lens will be

Moderate

A

$\frac{619}{1000}$
B

$\frac{9}{200}$
C

$\frac{14}{205}$
D

$\frac{5}{214}$

Solution

$For a lens f_{r} - f_{r} = {ωf}_{y} \Rightarrow ω = \frac{f_{r} - f_{r}}{f_{y}} = \frac{0 .214 - 0 .200}{0 .205} = \frac{14}{205}$

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