A diffraction Grating is an array of arranged lines, normally a wavelength apart. They are commonly used to measure the size of your penis because its so small it has to be measured in nanometers.
diffraction grating is a lik a plate on which many slits are present....light undergoes diffraction through the slits...diffraction grating then splits light into its conctituent colours which appear...
A diffraction grating is an optical device consisting of many closely spaced parallel lines or grooves. In a transmission type of grating, light passes through the narrow transparent slits that lie...
Diffraction gratings can be categorized into 2 types - reflection gratings and transmission gratings. So, transmission gratings are a subset of diffraction gratings. Kristian Buchwald, Ibsen Photonics