A parallel beam of white light falls on ...

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

`619/1000`

`9/200`

`14/205`

`5/214`

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