Yellow light ($\lambda $ = 6000 A) illuminates a single slit

Yellow light ($\lambda $ = 6000 A) illuminates a single slit of width 1 x ${{10}^{-4}}$ m. Calculate : (i) the distance between the two dark lines on either side of the central maximum, when the diffraction pattern is viewed on a screen kept 1.5 m away from the slit, (ii) the angular spread of the first diffraction minimum.