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Question

Define critical angle.


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Solution

Critical angle:

  1. The critical angle is the incidence angle at which the angle of refraction is 90.
  2. The light should flow from a denser optical medium towards a less dense optical medium.
  3. The critical angle will be 48.6 for water-air boundaries and 61.0 for crown glass-water boundaries.

Mathematical representation:

Thecriticalangle=Theinversefunctionofthesineofrefractionindexincidentindexθcric=Sin-1nrni

Refractive index:

A number determined by dividing the speed of light within a vacuum by the speed of light inside a denser medium is called the refractive index.


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