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      Question

      What happens to the wavelength of light when it passes

      from a medium of higher refractive index to a medium of lower refractive index?  
      A It increases Correct Answer Incorrect Answer
      B It decreases Correct Answer Incorrect Answer
      C It remains the same Correct Answer Incorrect Answer
      D It becomes zero Correct Answer Incorrect Answer

      Solution

      When light passes from a medium with a higher refractive index to one with a lower refractive index, its speed increases, and thus its wavelength also increases.   This is a consequence of the relationship between speed, frequency, and wavelength.   The frequency of light remains constant, but the wavelength changes when the light enters a different medium.

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