(n) optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum, Syn.grating
v. t. [ imp. & p. p. Diffracted; p. pr. & vb. n. Diffracting. ] [ L. diffractus, p. p. of diffringere to break in pieces; dif- = dis- + frangere to break. See Fracture. ] To break or separate into parts; to deflect, or decompose by deflection, a&unr_; rays of light. [ 1913 Webster ]
n. [ Cf. F. diffraction. ] (Opt.) The deflection and decomposition of light in passing by the edges of opaque bodies or through narrow slits, causing the appearance of parallel bands or fringes of prismatic colors, as by the action of a grating of fine lines or bars. [ 1913 Webster ]
Remarked by Grimaldi (1665), and referred by him to a property of light which he called diffraction. Whewell. [ 1913 Webster ]
Diffraction grating. (Optics) See under Grating. -- Diffraction spectrum. (Optics) See under Spectrum. [ 1913 Webster ]
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