Formula for dispersive power is (where s...

Formula for dispersive power is (where symbols have their usual meanings) or if the refractive indices of crown glass for red, yellow and violet colours are respectively `mu_(r),mu_(y)` and `mu_(v)` then the dispersive power of this glass would be

A

`(mu_(v)-mu_(y))/(mu_(r)-1)`

B

`(mu_(v)-mu_(r))/(mu_(y)-1)`

C

`(mu_(v)-mu_(y))/(mu_(y)-mu_(r))`

D

`(mu_(v)-mu_(r))/(mu_(y))-1`

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The correct Answer is:

b

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