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In a certain spectrum produced by a glas...

In a certain spectrum produced by a glass prism of dispersive power `0.0305,` it is found that the refractive index for the red ray is `1.645.`and that for the violet ray is `1.665`. What is the refractive index for the yellow ray?

Text Solution

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Given, dispersive power, `omega=0.030`
`mu_(R )=1.645, mu_(B)=1.665`
We know that,
`omega=(mu_(B)-mu_(R ))/(mu_(Y)-1)`
`rArr" "mu_(Y)=1+(mu_(B)-mu_(R ))/(omega)=1+(1.665-1.645)/(0.030)`
`=1.666`
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