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A thin prism P(1) of angle 4^(@) and ref...

A thin prism `P_(1)` of angle `4^(@)` and refractive index `1.54^(@)C` is combined with another thin prism `P_(2)` of refractive index 1.72 to produce dispersion without deviation. The angle of `P_(2)` is

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In case of thin prism `delta=(mu-1)A` when two prism are combined together
`delta=delta_1+delta_2=(mu-1) A +(mu-1)A.`
For producing dispersion without deviation
`delta=0 i.e., (mu-1)A.=-(mu-1) A ` or
`A.=- ((1.54-1))/((1.72-1)) times 4^@=-3^@`
So the angle of the other prism is `3^@` and opposite to the first.
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