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For a prism kept in air, it is found tha...

For a prism kept in air, it is found that for an angle of incidence `60^(@)`, the angle of refraction A, angle of deviation `delta` and anble of emergence e become equal. Then, the refractive index of the prism is

A

1.73

B

1.15

C

1.5

D

1.33

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