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A thin prism P of refracting angle 3^(@)...

A thin prism P of refracting angle `3^(@)` and refractive index . 1.5 is combined with another thin prism Q of refractive index 1.6 to produce dispersion without deviation. Then the angle of prism Q is

A

`3^(@)`

B

`4^(@)`

C

`3.5^(@)`

D

`2.5^(@)`

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The correct Answer is:
D
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