A circular beam of light of diameter `d = 2 cm` falls on a plane refractive of glass. The angle of incidence is `60^(@)` and refractive index of glass is `mu = 3//2`. The diameter of the refracted beam is
A. `4.00 cm`
B. `3.0 cm`
C. `3.26 cm`
D. `2.52 cm`