Q.

The focal lengths of convex lens for red and blue light are 100 cm and 96.8 cm respectively. The dispersive power of material of lens is

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a

0.325

b

0.0325

c

0.98

d

0.968

answer is B.

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Detailed Solution

ω=fR−fVfy=fR−fVfVfR  Putting value of fV and fR we get ω=0.0325
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