1.

In the visible region,the dispersive power and the mean angular deviations for crown glass and flint glass are w' and w' respectively .when two prisms are combined,the condition of zero dispersion by the combination is

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Explanation:

The ANGULAR dispersion is defined as angle between the two extreme colours of light . DISPERSIVE power of a prism is defined as the RATIO of angular dispersion to the DEVIATION of MEAN colour.



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