The groove density (mm-1) of a grating determines its dispersion, while the angle of the groove determines the most efficient region and blaze wavelength of the spectrometer. The greater the groove density, the better the optical resolution possible, but the more truncated the spectral range. Groove density in mm-1 is sometimes written as lines per [..]

The number of grooves per area, specified as grooves/ mm or grooves/ inch of a grating. It is used to determine the groove spacing and, with the grating equation, to obtain information about the diffr [..]