Physics11
7.1–Reflection
LearningIntentions:
Ican:
ü Comparedifferentwavesontheelectromagneticspectrum
ü Explainthelawofreflection
ü UseRaydiagramstosolveproblemsinvolvingplanemirrors.
TheElectromagneticSpectrum
Radiantenergythattravelsatthespeedoflight(______________________)iscallediscalled
electromagneticradiation.__________isanexampleofa____________phenomenonthatfallsunder
theelectromagneticspectrum.Onlya____________percentageoftheE-Mspectrumis
_______________tothehumaneye.Wecallthis________________light.Changesin
_________________and__________________oflightinthevisiblespectrumarewhatweseeas
differencesin_____________________.E-Mradiationthatisverylowfrequencymusthavea
____________wavelength.Examplesoflowfrequencyradiationare______________wavesand
_______________.E-MRadiationthatisveryhighfrequencymusthavea_______________
wavelength.Examplesofhighfrequencyradiationinclude__________and______________rays.
***Chartsonpg.201and202haveinformationonthewavelengthandfrequencyofEMwaves***
Physics11
LinearPropagationofLight
Lighttravelsin_____________lines(sometimes).Overshortdistances,inagivenmediumsuchas
_______orwater,lighttravelsinastraightpath.Iflightencountersa_______________mediumor
_________________surface,itspathwillchange.______________canalsodeflectlightfromastraight
path.
Todescribethelinearpropagationoflight,wedraw____________________________.Intheseimages,
lightisdepictedasa_______________linewhichwecalla_________.
Example:
TheLawofReflection
Ifyoulookdirectlyintoamirrorandwinkyour_____________eye.Inthemirroryour__________eye
appearstobewinking.
Imaginestanding1metreawayfromthemirror.Whatfractionofyourbodydoyousee?Nowimagine
steppingbackafewmetresandconsideringthesamemirror.Howmuchofyourbodywillyousee?
Arayapproachingamirroriscalledan_____________ray.A________________rayisthelightthathas
beenreflectedfromthemirror.Weuseadashedlinetorepresentadistanceperpendiculartothe
mirrorwhichiscalledthe______________.Thisisusedasapointofreferencetomeasurethe
___________oftheincidentandreflectingrays.Wecalltheanglebetweenthe________________ray
andthe______________the_____________________________________.Wecalltheanglebetween
the________________rayandthe______________the_____________________________________.
i.e.
Physics11
ImageformationinaPlaneMirror
A___________mirrorisalsocalleda_____________mirror.Whenyoulookintothemirroryouseean
_______________thatappearstobeyou,buthasseveralcharacteristicsthatmakeyourmirrorimage
_______________.
Animagethatcanbe________________ontoascreeniscalleda_____________image.Your
reflectionfroma________________can’tdothisandiscalleda________________image.Avirtual
imageappearstobe_______________anobject.
I.e
Thevirtualimageisan______________reflectionoftherealpersonor_______________soithasthe
followingcharacteristics:
•
•
•
Theimageis_______________,
Theimageisthe_______________sizeastheoriginalobject
Itisthesame__________________fromthesurfaceofthemirrorasthe_____________or
objectisfromthemirror.
Example:
Imagineyouarea2mtallbasketballplayer.Usearaydiagramtodeterminehowlargeamirrormustbe
todeterminetheshortestmirrorrequiredtoseeyourwholeselfinit.
Assignment:P.210#1-13