In the visible region the dispersive pow...

In the visible region the dispersive powers and the mean angular deviations for crown and flint glass prisms are `omega', omega'` and `d, d` respectively. The condition for getting deviation without dispersion when the two prisms are combined is

`sqrt(omega d) + sqrt(omega' d') = 0`

`omega' d + omega d' = 0`

`omega d + omega' d' = 0`

`(omega d)^(2) + (omega' d')^(2) = 0`

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