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A thin prism of angle 7^@ and refractive...

A thin prism of angle `7^@` and refractive index 1.5 is combined with another prism of angle `theta` and refractive index 1.7. The emergent ray goes undeviated. What is the value of `theta` ?

A

`3^@`

B

`5^@`

C

`9^@`

D

`11^@`.

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