Solve question 40

40.  A monochromatic beam of light is incident at 60 ° on one face of an equilateral prism of refractive intex n and emerges from the opposite face making an angle θ (n) with the normal (see the figure). For n = 3  the value of θ is 60 ° and d θ d n   =   m .   The value of m is                                         [JEE Advane - 2015]

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