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Question

A rod made of glass (μ=1.5) and of square cross-section is bent into shape shown in fig. A parallel beam of light falls perpendicular on the plane flat surface A. Referring to diagram, d is the width of a side and R is the radius of inner semicircle. Find the maximum value of ratio fraction numerator d over denominator R end fraction so that all light entering the glass through surface A emerge from the glass through surface B.

  1. 0.5    
  2. 0.3    
  3. 0.9    
  4. 0.7    

The correct answer is: 0.5

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