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Question

A paraxial beam is incident on a glass (n = 1.5) hemisphere of radius R = 6 cm in air as shown. The distance of point of convergence F from the plane surface of hemisphere is

  1. 12 cm    
  2. 5.4 cm    
  3. 18 cm    
  4. 8 cm    

The correct answer is: 8 cm

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