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Q.

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 0.20m, 0.205m and 0.214m respectively. The dispersive power of the material  of the lens will be

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a

6191000

b

14205

c

9200

d

5214

answer is B.

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Detailed Solution

1f=μ-11R1+1R2 -dff2=dμ1R1+1R2 -dff1f=dμ1R1+1R2 -dffμ-11R1+1R2=dμ1R1+1R2 -dff=dμμ-1=ω dispersive power  df=0.214-0.20=0.014 and f =0.205
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