A rod of glass (mu=1.5) and of square cr...

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 are then for what maximum value of `(d)/(R )` light entering the glass slab through surface A emerges from the glass through B

1.5

0.5

1.3

None of these

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