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Question

A diverging beam of light from a point source S having divergence angle a, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is

  1. Zero    
  2. alpha    
  3. sin to the power of negative 1 end exponent invisible function application left parenthesis 1 divided by n right parenthesis    
  4. 2 sin to the power of negative 1 end exponent invisible function application left parenthesis 1 divided by n right parenthesis    

The correct answer is: alpha


    Since rays after passing through the glass slab just suffer lateral displacement hence, we have angle between the emergent rays as alpha

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