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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

A

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

B

`omega'd + omegad' = 0`

C

`omegad + omega'd' = 0`

D

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

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The correct Answer is:
C
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