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Calculate the dispersive power for crown...

Calculate the dispersive power for crown and flint glass prism from the following data :For crown glass, `m_(b) = 1.522, m_(r ) = 1.514`. For flint glass, `mu'_(b) = 1.662, mu'_(r ) = 1.644`

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For crown glass,
`mu_(b) = 1.522, mu_(r ) = 1.514`
`mu = (mu_(b) + mu_(r))/(2) = (1.522 + 1.514)/(2) = 1.518`
`omega = (mu_(b) - mu_(r ))/(mu -1) = (1.522 - 1.514)/(1.518 -1) = (0.008)/(0.518)`
`= 0.01544`
For flint glass,
`mu' = (mu'_(b) + mu'_(r))/(2) = (1.662 + 1.644)/(2) = 1.653`
`omega' = (mu'_(b) - mu'_(r ))/(mu' -1) = (1.662 - 1.644)/(1.653 -1) = (0.018)/(0.653)`
`= 0.0276`
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