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A rod made of glass (mu = 1.5) and of sq...

A rod made of glass `(mu = 1.5)` and of square cross-section is equal is bent into the shape shown in figure. A parallel beam of light falls perpendicular on the plane flat surface . Referring to the diagram, d is the width of a side & R is radius of inner semicircle. find the maximum value of ratio `(d)/(R)` so that all light entering the glass through surface A emerge from the glass through surface B.

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