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Easy

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. a    
  3. s i n to the power of negative 1 end exponent invisible function application left parenthesis 1 divided by n right parenthesis    
  4. 2 s i n to the power of negative 1 end exponent invisible function application left parenthesis 1 divided by n right parenthesis    

The correct answer is: a

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