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A ray of light is incident normally on one of the faces of a proms of apex 30 to the power of 0  and  n=square root of 2 what is the angle of deeviation which of the following is true?

  1. 45 to the power of 0
  2. 30 to the power of 0
  3. 15 to the power of 0
  4. 60 to the power of 0

The correct answer is: 15 to the power of 0

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