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The speed of light with the rise in the temperature of the medium

  • A.Increases
  • B.Decreases
  • C.Remains unaltered
  • D.Drops sharply

Answer: C

The speed of light in a medium remains unaltered by a change in the medium's temperature, to any appreciable degree.

It depends on the medium's refractive index, which is set by its optical density rather than by its temperature. In vacuum the speed is a fixed constant, 3 × 108 m/s.

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