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A ray of light incident at an angle thet...

A ray of light incident at an angle `theta` on a refracting face of a prism emerges from the other face normally. If the angle of the prism in `5^@` and the prism is made of a material of refractive index 1.5, the angle of incidence is:

A

`7.5^@`

B

`5^@`

C

`15^@`

D

`2.5^@`

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