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

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

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