@prefix mdl: <http://data.loterre.fr/ark:/67375/MDL> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

mdl:-GKP47ZJ4-0
  skos:prefLabel "diffraction de la lumière"@fr, "light diffraction"@en ;
  a skos:Concept ;
  skos:broader mdl:-DC1S0HC8-4 .

mdl:-ZF8R4WQL-P
  skos:prefLabel "electromagnetic property"@en, "propriété électromagnétique"@fr ;
  a skos:Concept ;
  skos:narrower mdl:-DC1S0HC8-4 .

mdl:-T6P6ZQ4W-H
  skos:prefLabel "diffraction optique"@fr, "optical diffraction"@en ;
  a skos:Concept ;
  skos:broader mdl:-DC1S0HC8-4 .

mdl:-LG8HTW77-D
  skos:prefLabel "diffraction de Fresnel"@fr, "Fresnel diffraction"@en ;
  a skos:Concept ;
  skos:broader mdl:-DC1S0HC8-4 .

mdl:-WR13LRXK-L
  skos:prefLabel "diffraction des ondes"@fr, "wave diffraction"@en ;
  a skos:Concept ;
  skos:broader mdl:-DC1S0HC8-4 .

mdl:-DC1S0HC8-4
  skos:definition "Diffraction is defined as the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/aperture. The diffracting object or aperture effectively becomes a secondary source of the propagating wave. Italian scientist Francesco Maria Grimaldi coined the word diffraction and was the first to record accurate observations of the phenomenon in 1660. In classical physics, the diffraction phenomenon is described by the Huygens–Fresnel principle that treats each point in a propagating wavefront as a collection of individual spherical wavelets. The characteristic bending pattern is most pronounced when a wave from a coherent source (such as a laser) encounters a slit/aperture that is comparable in size to its wavelength, as shown in the inserted image. This is due to the addition, or interference, of different points on the wavefront (or, equivalently, each wavelet) that travel by paths of different lengths to the registering surface. If there are multiple, closely spaced openings (e.g., a diffraction grating), a complex pattern of varying intensity can result. (Wikipedia, The Free Encyclopedia, <a href=\"https://en.wikipedia.org/wiki/Diffraction\" target=\"_blank\">https://en.wikipedia.org/wiki/Diffraction</a>)"@en, "La diffraction est le comportement des ondes lorsqu'elles rencontrent un obstacle ou une ouverture ; le phénomène peut être interprété par la diffusion d’une onde par les points de l'objet. La diffraction se manifeste par des phénomènes d'interférence. La diffraction s’observe avec la lumière, mais de manière générale avec toutes les ondes : le son, les vagues, les ondes radio, rayons X, etc. Elle permet de mettre en évidence le caractère ondulatoire d'un phénomène et même de corps matériels tels que des électrons, neutrons, atomes froids. (Wikipedia, L'Encylopédie Libre, <a href=\"https://fr.wikipedia.org/wiki/Diffraction\" target=\"_blank\">https://fr.wikipedia.org/wiki/Diffraction</a>)"@fr ;
  skos:prefLabel "diffraction"@fr, "diffraction"@en ;
  skos:broader mdl:-ZF8R4WQL-P ;
  skos:narrower mdl:-LG8HTW77-D, mdl:-D5PDRD36-Z, mdl:-GKP47ZJ4-0, mdl:-WR13LRXK-L, mdl:-T6P6ZQ4W-H ;
  skos:hiddenLabel "diffractions"@en, "diffractions"@fr, "Diffraction"@fr, "Diffraction"@en ;
  skos:exactMatch <https://en.wikipedia.org/wiki/Diffraction>, <https://fr.wikipedia.org/wiki/Diffraction> ;
  skos:inScheme mdl: ;
  a skos:Concept .

mdl:-D5PDRD36-Z
  skos:prefLabel "diffraction de Fraunhofer"@fr, "Fraunhofer diffraction"@en ;
  a skos:Concept ;
  skos:broader mdl:-DC1S0HC8-4 .

mdl: a skos:ConceptScheme .