Reviewed: one independent reader; copy check clear.
diffraction grating
diffraction grating A diffraction grating is a device from which light or other radiation can be reflected so that waves of different periods are dispersed into different directions.
A diffraction grating is a device from which light or other radiation can be reflected so that waves of different periods are dispersed into different directions. In this way it is used to produce a spectrum, separating the radiation into distinct colour bands or lines.