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Question

If the refractive indices of crown glass for red, yellow and violet colours are respectively μr,μy,μv, then the dispersive power of this glass would be

A
μvμrμy1
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B
μvμyμr1
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C
μvμyμyμr
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D
μvμrμy1
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Solution

The correct option is A μvμrμy1
Dispersive power of a glass is given by ratio of difference of reflective index of two extreme wavelength to the difference of intermediate wavelength to unity i.e.

DispersivePower=μvμrμy1

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