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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

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$\frac{9}{200}$

$\frac{5}{214}$

$\frac{619}{1000}$

$\frac{14}{205}$

answer is C.

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Detailed Solution

$ω = \frac{f_{R} - f_{v}}{f_{y}} = \frac{0.214 - 0.200}{0.205} = \frac{14}{205}$

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