Laser light with wavelength 668 nm is directed at a single slit with a width of 0.628 mm. A diffraction pattern from the slit is then measured on a screen 3.78 m away. What is the distance from the first dark fringe above the central bright spot to the first dark fringe below the central bright spot? Give your answer in units of mm.

Laser light with wavelength 668 nm is directed at a single slit with a width of 0.628 mm. A diffraction pattern from the slit is then measured on a screen 3.78 m away. What is the distance from the first dark fringe above the central bright spot to the first dark fringe below the central bright spot? Give your answer in units of mm.