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《“random or polarized”“随机或极化”》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。
1、PolarizedorUnpolarizedPurpose:Anactivitytoexplorethewavenatureoflightbytestingthepolarizationpropertiesoflightsourcesincludinglightbulbs,digitaldisplays,lasersandothers.StudentInfo:1)DesignedforPhysicalScience(9/10)orPhysics(11/12)2)PriorKnowledge:Waves–L
2、ongitudinalvs.Transverse,EMRadiation,Electric&MagneticFieldOscillationPerpendiculartoWavePropagation3)SuggestedWebsite(s)http://www.glenbrook.k12.il.us/GBSSCI/PHYS/CLASS/light/u12l1e.htmlTeacherInfo:1)PriorKnowledge:EMwavedescription,vectorcomponents&LCDo
3、peration2)Vocabulary:Propagation,Perpendicular,Vector,Component,Polarization3)SuggestedWebsite(s)http://www.polarization.com/sky/sky.htmlTimeRequired:1)Setup»20min2)Activity»30min3)DataAnalysis»20min4)Discussion/WrapUp»10minMaterialsNeeded:1)Two2”x2”polar
4、izerspergroup(1perstudentifassigningashomework)**Polaroidavailablein10piecekitsfromsciplus.comorelsewhere2)Sunglasses–PolarizedandUnpolarized3)LightSources-FluorescentandIncandescentBulbs,Flashlight,LEDs,…4)Television/CRT(OldStyleMonitor)ScreenandLCD(NewS
5、tyleMonitor)5)Digitalclocks,calculators,watch,stopwatchs,cellphone,Ipod,…6)Lasers(PointerPen,HeliumNeon,GreenAstronomical,…)–TEACHERONLY!***Note:SunglassesareVerticallyPolarized(toeliminatedHorizontalGlare)andcanbeusedtodeterminethepolarizationdirectionfo
6、rtheplasticsheets***Procedure:PartA:UnderstandingPropertiesofthePolarizers1)SinglePolarizerwithRoomLightsLookingthruapolarizer,rotateitafull360°andnoticelittlevariationinthebrightness.Thisindicatesthatordinaryroomlightsareunpolarizedastherandomprocesswhic
7、hproducestheunpolarizedlighthasnopreferredelectricfielddirection.·Note:Theskyisslightlypolarized,sosomevariationdoesoccur.61)DualPolarizerwithRoomLightsWiththepolarizationdirectionalignedfortwopolarizersplacedontopofeachother,lookthroughbothtoobservethero
8、omlights.Thebrightnessshouldbedimmerthanforthesinglepolarizer(moreabsorption),butthelightisstillvisible.Nowslowlyrotateonepolarizerrelativetothesecondoneuntilitisrotated90°andthepolarizationdirectionsareperpendicula
