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There is a prism with refractive index equal to square root of 2 and the refracting angle equal to 30 to the power of 0. One of the refracting surfaces of the prism is polished. A beam of monochromatic light will retrace its path if its angle of incidence over the refracting surface of the prism is.........

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  1. 45 to the power of 0
  2. 0 to the power of 0
  3. 60 to the power of 0
  4. 30 to the power of 0

    Answer:The correct answer is: 45 to the power of 0

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