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A thin prism P1 with angle 4^@ and made ...

A thin prism `P_1` with angle `4^@` and made from glass of refractive index 1.54 is combined with another prism `P_2` made from glass of refractive index 1.72 to produce dispersion without deviation. What is the angle of the prism `P_2` ?

A

`5.33^@`

B

`4^@`

C

`3^@`

D

`2.6^@`.

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