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A thin prism having refracting angle 10^...

A thin prism having refracting angle `10^(@)` is made of glass of refracting index `1.42`. This prism is combined with another thin prism of glass of refractive index `1.7`. This combination produces dispersion without deviation. The refracting angle of second prism should be `:`

A

`6^(@)`

B

`8^(@)`

C

`10^(@)`

D

`4^(@)`

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The correct Answer is:
A
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