As angle of deviation depends upon the prism material, we are in a position to put together prisms of different materials in such a way that the net outcome is such that while dispersion remains, deviations get cancelled out.
This can be done when deviation (d1) produced by first prism is equal and opposite to the deviation (d2) produced by the second prism.
So, for net resultant deviation,
13.8.2 Deviation without dispersion
If d1 and d2 are the deviation the deviation suffered by the mean light ray in 1st and 2nd prism, then the following is the condition to get deviation without dispersion.
where w1 and w2 are the respective dispersive powers.
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