The angle of incidence for a ray of light at a refracting surface of a prism is 45 . The angle of prism is 60 . If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are :

1. A. 45 , 1 2
2. B. 30 , 2
3. C. 45 , 2
4. D. 30 , 1 2

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