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A rod of glass ( mu = 1.5) and of squar...

A rod of glass `( mu = 1.5)` and of square cross section is bent into the shape shown in the figure. A parallel beam of light falls on the plane flat surface A as shown in the figure. If d is the width of a side and R is the radius of circular arc then for what maximum value of `(d)/(R)` light entering the glass slab through surface A emerges from the glass through B

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