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      Question

      What is the unit of the refractive

      index?
      A Metre per second Correct Answer Incorrect Answer
      B Radian Correct Answer Incorrect Answer
      C Ohm Correct Answer Incorrect Answer
      D None of the above Correct Answer Incorrect Answer

      Solution

      The refractive index is a dimensionless quantity that measures how much light bends when it passes from one medium to another. Since it is a ratio of speeds, it has no units.

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