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Question

The ratio of speed of light in vacuum to that in a medium is called ___________ (refractive index/focal length).


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Solution

  1. The cause of refraction is the change in the speed of light as it moves from one medium to another.
  2. The refraction of light in a given medium can be expressed in terms of a factor called the refractive index of the medium.
  3. Refractive index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium.
  4. It is also called the index of refraction. It is denoted by the Greek letterμ.
    Refractiveindex=SpeedoflightinvacuumSpeedoflightinthemediumμ=CV.

Thus, the ratio of the speed of light in vacuum to that in a medium is called the refractive index.


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