When the angle of incidence on a material is `60^(@)`, the reflected light is completely polarised. The velocity of the refracted ray inside the materials is (in m//sec^(-1))
A. `3xx10^(8)`
B. `((3)/(sqrt(2)))xx10^(8)`
C. `sqrt(3)xx10^(8)`
D. `0.5xx10^(8)`
