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1、第1章总结与习题专业英语知识要点例题HanQun@TJU2012年5月28日13:47:571专业英语1.TheLawofRectilinearpropagationLightasitadvancesthroughfreespaceorthroughhomogeneous,isotropicmediumfollowsabeeline(adirectstraightcourse).Example:Shadows2.TheLawofReflectionAlightraystrikingareflectingsurfaceandrefl
2、ectedfromitmakesequalangleswiththenormaltothesurfaceatthepointofincidence,andtheincomingray(incidentray),theoutgoingray(reflectedray),andthenormaltothesurfaceatthepointofintersectionalllieinthesameplane.(Incidentangle,reflected~)HanQun@TJU2012年5月28日13:47:5923.TheLawof
3、Refraction(Snell’sLaw)Theanglemadebytheincidentray,thatmadebytherefractedray,withthesurfacenormalatthepointofincidenceinarefractiveprocessobeytheexpressionnsinI=n'sinI'Theincidentray,therefractedray,andthesurfacenormalareallcoplanar.4.TotalInternalReflection-TIRWhenar
4、ayincidentfromadensermediumtothesurfacewithararermedium,iftheangleofincidenceisgreaterthanthecriticalangle,alloftheraywillbereflectedbackfromthesurface,withnoneofitbeingtransmitted,eventhoughthesecondmaterialistransparent.Criticalangleistheincidentangleforwhichtherefr
5、actedrayemergestangenttothesurface.Densermediumisthemediumwhoseindexofrefractionislarger.normalIncidentrayRefractedrayDensermediumRarermediumCriticalangleSurfaceHanQun@TJU2012年5月28日13:48:3235.Fermant’sPrincipleLighttakesthepaththattheopticalpathlength(OPL)getsitsextre
6、mum(maximum,minimum,orconstant).Lighttakesthepaththatrequirestheleasttime.6.Object/ImagespaceObject(image)spaceisthespacewheretheobject(image)islocated.Bothextendfrominfinityononesidetoinfinityontheotherandcompletelyoverlap.Whetheragivenpointisintheobjectspaceortheima
7、gespacedependsonwhetheritispartofaraybeforeorafterrefraction.Ifagivenpointisintheobjectspace,itisapointobject,otherwiseitisapointimage.7.CoaxialopticalsystemTheopticalsysteminwhichthecenterofcurvatureofallthesurfacesareonthesameline(opticalaxis)HanQun@TJU2012年5月28日13:
8、48:0048.SomekeywordsandconceptsRefracting/ReflectingsphericalsurfaceRadiusofcurvatureConjugate(~points,~planes,~distanceetc)
