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Question

# Two prisms A and B are in contact with each other have angular dispersion of 2o and 4o respectively The dispersive power of 'A' is 0.002. If the combination produces dispersion without deviation that dispersive power of 'B'

A
0.001
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B
0.004
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C
0.002
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D
0.006
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Solution

## The correct option is D 0.004Angular dispersion of prism A = 2∘Angular dispersion of prism B = 4∘Dispersive power of A = (δV−δR)AδA⇒0.002=2∘δA⇒δA=2∘0.002As there is no deviation, δA=δBDispersive power of B =(δV−δR)BδB=4∘2×0.0002=0.004∘The dispersive power of B is 0.004.

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