JEE Advanced 2015 Paper 2

A monochromatic beam of light is incident at 60° on one face of an equilateral prism of refractive of refractive index n and emerges from the opposite face making an angle θ(n) with the normal(see the figure).For n=√3 the vlaue of θ is 60° and

dθ

dn

=m.The value of m is