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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 number of grating lines per mm.

Screen to Grating Distance (3-10m) 6.95
Diffraction grating
Laser
Grating lines per mm (200-500) ???
Screen to grating distance
Screen
Wavelength (400-700 nm) 596.5

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