The distance between the first and sixth minima in the diffraction pattern of a single slit, it is 0.5 mm. The screen is 0.5 m away from the Slit. If the wavelength of light is 5000 Å, then the width of the slit will be _____________ mm
(A) 5 (B) 2.5 (C) 1.25 (D) 1.0