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Question

# By properly combining two prisms made of different materials, it is not possible to have

A
dispersion without average deviation
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B
deviation without dispersion
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C
both dispersion and average deviation
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D
neither dispersion nor average deviation
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Solution

## The correct option is C neither dispersion nor average deviationThe given combination gives a zero dispersion and zero average deviation combination of two prisms. But this happens only when the material of the prisms is same. If material of one of them is different, and prism are rotated in such a way that one of deviation or dispersion gets removed, the other would remain.

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