If the refractive indices of crown glass for red, yellow and violet colours are respectively μr,μy and μv, then the dispersive power of this glass would be:
A
μv−μrμy−1
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B
μv−μyμr−1
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C
μv−μyμy−μr
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D
μv−μrμy−1
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Solution
The correct option is Aμv−μrμy−1 For small A and For violet : For red: For yellow: Dispersive power of prism Putting expressions as derived above, Therefore,