Physics-
General
Easy
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 
so that all light entering the glass through surface A emerge from the glass through surface B.
- 0.5
- 0.3
- 0.9
- 0.7
The correct answer is: 0.5
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