1.

A light ray enters from medium A to medium B as shown in the given Figure .The refractive index of medium B relative to A will be (a) greater than unity (b) less than unity (c) equal to unity(d) zero

Answer»

The answer is (b) less than unity

  • Here the ray of light bends away from normal when it enters from medium A into medium B.
  • This shows that medium B is optically rarer than medium A. 
  • Therefore, speed of light in medium B is more than speed of light in medium A. 
  • So, ratio of speed of light in medium A to speed of light in medium B will be less than one.


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