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1、装订线班级：姓名：学号:1OOptics20-1Twowavesoflightinair,ofwavelengthλ=600.0nm,areinitiallyinphase(同相位).TheythentravelthroughplasticslayersasshowninFig.withL1=4.00μm,L2=3.50μm,n1=1.40,andn2=1.60.(a)Whatthemultipleofλgivestheiropticalpathdifference(光程差)aftertheybothhaveemergedfromthelayers?(b)
2、Ifthewaveslaterarriveatsomecommonpointwiththesameamplitude,istheirinterferencefullyconstructive,fullydestructive,intermediatebutclosertofullyconstructive,orintermediatebutclosetofullydestructive?[(a)0.833,(b)morenearlyconstructivethandestructive]L2n2n1L120-2Inadouble-slitexperimen
3、titisfoundthatbluelightofwavelength460nmgivesasecond-ordermaximumatacertainlocationonthescreen.Whatwavelengthofvisiblelightwouldhaveaminimumatthesamelocation?[613nm]20-3Averythinsheetofplastic(n=1.6)coversoneslitofadouble-slitapparatusilluminatedby640-nmlight.Thecenterpointonthesc
4、reen,insteadofbeingamaximum,isdark.Whatisthe(minimum)thicknessoftheplastic?[533nm]1Optics装订线20-4Alensappearsgreenishyellow(λ=570nmisstrongest)whenwhitelightreflectsfromit.Whatminimumthicknessofcoating(n=1.28)doyouthinkisusedonsucha(glass)lens?[223nm]20-5Athinfilmofalcohol(n=1.36)l
5、iesonaflatglassplate(n=1.51).Whenmonochromaticlight,whosewavelengthcanbechanged,isincidentnormally,thereflectedlightisaminimumforλ=512nmandamaximumforλ=640nm.Whatisthethicknessofthefilm?[471nm]20-6Aplanewaveofmonochromaticlightisincidentnormallyonauniformthinfilmofoilthatcoversagl
6、assplate.Thewavelengthofthesourcecanbevariedcontinuously.Fullydestructiveinterferenceofthereflectedlightisobservedforwavelengthsof500and700nmandfornowavelengthsinbetween.Iftheindexofrefractionoftheoilis1.30andthatoftheglassis1.50,findthethicknessoftheoilfilm.[673nm]2Optics装订线20-7I
7、nFig.,abroadbeamofwavelength683nmissentdirectlydownwardthroughthetopplateofapairofglassplates.Theplatesare120mmlong,touchattheleftend,andseparatedby48µmattherightend.Theairbetweentheplatesactsasathinfilm.Howmanybrightfringeswillbeseenbyanobserverlookingdownthroughthetopplate?[141]
8、20-8InFig.,abroadbeamofwavelength
