A parallel beam of light of wavelength `6000Å` gets diffracted by a single slit of width 0.3 mm. The angular position of the first minima of diffracted light is :
A. `6 xx 10^(-3)` rad
B. `1.8 xx 10^(-3)` rad
C. `3 xx 10^(-3)` rad
D. `2 xx 10^(-3)` rad
