A diffraction grating is placed in front of a laser beam, resulting in various bright spots appearing on a screen. Given the following values, and the positions of the dots on the screen (in metres), find the distance from the grating to the screen, in metres.

Screen to Grating Distance (3-10m) 777 Grating lines per mm (200-500) 319 Wavelength (400-700 nm) 448 5' Diffraction grading Laser Screen to grating distance