What is GRATING?

An arrangement of alternate reflecting and non-reflecting elements, eg wire screens or closely spaced lines ruled on a flat or concave reflecting surface, which, through diffraction of the incident radiation analyses this into its frequency spectrum. An optical grating can contain a thousand lines or more per centimetre. A standing wave system of high-frequency sound waves with their alternate compressive and rarefied regions can give rise to a diffraction grating in liquids and solids. With a criss-cross system of waves, a three-dimensional grating is obtainable,

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