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A ray of light is incident at an angle o...

A ray of light is incident at an angle of `60^@` on one face of a prism which has an angle of `30^@`. The ray emerging out of the prism makes an angle of `30^@` with the incident ray. The refractive index of the material of the prism is

A

1

B

1.33

C

1.55

D

1.73.

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