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The angle of crown glass(mu=1.52) prism ...

The angle of crown glass`(mu=1.52)` prism is`5^(@)`.What should be angle flint glass`(mu=1.63)`.Prism ,so that the two prism may be used in direct vision spectroscope?

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For a direct vision spectroscope
`delta_(1)+delta_(2)=0`
`:.(mu_(1)-1)A_(1)+(mu_(2)-1)A_(2)=0`
or`A_(2)=-((mu_(1)-1)/(mu_(2)-1))A_(1)=-((1.52-1)/(1.63-1))xx5^(0)=-4.12^(@)`
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