A rod of glass (υ = 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 dR  light entering the glass slab through surface A emerges from the glass through B

(a)   1.5

(b)   0.5

(c)   1.3

(d)   None of these

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