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A ray of light is incident at 60^@ on on...

A ray of light is incident at `60^@` on one face of a prism which has angle `30^@`. The angle between the emergent ray and incident ray is `30^@`. The angle between the ray and the face from which it emerges is

A

`0^@`

B

`30^@`

C

`60^@`

D

`90^@`.

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