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Question

The figure shows a ray incident at an angle i equals pi divided by 3. If the plot drawn shown the variation of vertical line r minus i vertical line versus mu subscript 1 over mu subscript 2 equals k, (r=angle of refraction

  1. the value of k subscript 2 is 1
  2. the value of theta subscript 1 equals pi divided by 6
  3. the value of theta subscript 2 equals pi divided by 3
  4. All the above

The correct answer is: All the above

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