A parallel beam of light falls on a concave lens, image of blue, yellow and red light are formed on other side of a lens at a distance of 20cm,20.5cm and 21.4cm respectively.The dispersive power of the material of lens will be
A
6191000
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B
9200
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C
14205
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D
5214
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Solution
The correct option is C14205 Dispersive power(ω)=vred−vvioletvyellow=21.4−2020.5=14205