Reflectionoflight-光的反射(英文版)PPT课件.ppt

Reflectionoflight-光的反射(英文版)PPT课件.ppt

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Reflectionoflight

1 Youcanhaveaviewofyourselfifyoulookintoamirror.calmwatersurface.apieceofshinymetalwall.apieceofwindowglass.????

2 Nowyoulookintoamirrorandseetheimageofyourself.Infrontofthemirror.Onthesurfaceofthemirror.Behindthemirror.

3 Alexsays,‘Yourmirrorimageissmallerthanyourself’.Doyouagree?Yes,theimageisreallysmaller.No,yourimageandyouarealwaysofthesamesize.Itlookssmallerjustbecauseitisfarfromyou.No,itdependsonhowfaryoustandfromthemirror.Others:________.?

Arayoflightbouncesoffaplanemirror.mirrorThisisanexampleofreflectionoflight.1 Lawsofreflection

usefulwordstodescribethereflectionoflightreflectedrayincidentraynormalmirrorangleofincidenceangleofreflection1 Lawsofreflection

LawsofreflectionVideoSimulation

Theincidentray,thereflectedrayandthenormalalllieinthesameplane.normalincidentrayreflectedraymirrornormalincidentrayreflectedraymirror Lawsofreflection

normalincidentrayreflectedraymirrorangleofincidenceangleofreflection= Lawsofreflection

Regularreflectionparallelincidentraysparallelreflectedraysonaflat,smoothsurfacee.g.mirror2 Regularanddiffusereflection

Diffusereflectiononarough,notperfectlysmoothsurfacee.g.coverofabookparallelincidentraysreflectedraysindifferentdirections2 Regularanddiffuse reflection

Q1 Theanglebetweenthe…Theanglebetweentheincidentrayandthe_______iscalledtheangleofincidence.normalThelawsofreflectionstatethatitisequaltotheangleof___________.reflection

Q2 Theanglebetweenan…Theanglebetweenanincidentrayandthemirroris20?.Theanglesofincidenceandreflectionare____?and____?.Themirrorturnstherayby____?.707014020?70?70?

Q3 Trueorfalse:Reflectionof…Trueoffalse:Reflectionoflightbyaroughsurfacedoesnotobeythelawsofreflection.(T/F)

ImagesformedbyaplanemirrorVideo

Raysfrom

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