The refractive index of the material of prism is 72 and Its refracting angle is 30°. One of the refracting surfaces of the prism is made a mirror in wards. A beam of monochromatic light enters the prism from the other surface and the ray retraces from the mirrored surface. The angle of incidence is

The refractive index of the material of prism is 72 and Its refracting

1.	The refractive index of the material of prism is 72 and Its refracting angle is 30°. One of the refracting surfaces of the prism is made a mirror in wards. A beam of monochromatic light enters the prism from the other surface and the ray retraces from the mirrored surface. The angle of incidence is
Answer» `30^@` `45^@` `60^@` `0^@` Solution :`r_(2)=0` FIND `r_(1) + r_(2)=A,sini_(1)=musinr_(1)`

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