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1、amaddedAmt‘si;Dd’ip;ninthisBd&‘isnottoexplaint&J?r&.-_-..A.-..‘c,-pertiesokLightbyHypotheies,.buttopropole/andprovethembyReafonandEF:periments:Inordertowhich,Ifhall:premikthefqllowingDdinbtionsandAxioms.””1“......:.I,‘..i.I‘.E,E.p:I~,.I;,I‘-.’,:‘I‘I--;:.i,Q$?a?gibili$.of&beGQaysofLiiht,istheird
2、i@oj?tisntobe-ZcfraFtedorturnedoutoftheirWayinpasoutqfonetrm&.parentBodyorMediumintoamher.A?jdagreaterorlefs@p.fiargibilifyofCfays,istheir.D@oJtioutobettmedmoreor/es+.outoftheirWayinlikeIhcidemes071thelameMedium.h&tfieMmaticiansufilallyconfidertheRaysofLighttobcLines,.reachingfromtheluminousBody
3、COthebodyilluming-ted,andtherefra&ionoftlhoSeRaystobcthebendingorbreakingoifthofeLinesintheirpafingoutofoneMe-diumintoanother.AndthusmayRaysandRcfiaC‘t;ionsbeconfidered,ifLightbepropagatedinaninfIxnt,But:byanArgumenttakenfromtherEquationsoftherifxzesoftheEclipfesof‘$/$u.‘sSate&esitfccmsthatLight
4、ispropagatedintime,fpendinginitspafigefixrrrtheSuntousaboutSevenMinutesoftime:Andthercf?xxz1Iravechofentodefine,RaysandRefia&onsinftlchgancraltermsasmayagreeto.Lightinbothcaks,I3EFIEs.XII.xi&i&yofC!(yas,istlvirDi[p,/;tio?ltoGeturw?h&k[tit0deMediunzfromanyotherMediiumidpontpbo/^eSayfdce;Ehfall,Ai
5、tdqaysaremoreorlerq%xible,whi&nreretf4rnJackmoreorhJseasily.ASii/”Lightpafsourofc%&intoAir,andbybeinginclinedmoreandnxxctorhecomlmanSurfaceoftheGMandAir,beginsatlengthtobetotallyrefle&edbythatSurf&x5thofofortsofRayswhichatlikeIncidenccsarerefle&edmoficopiously3orbyin&cliningtheRaysbeginSoon&CObe
6、rurallyrcfle&ed,arem.ofii,eflexiblc..DE*cidence3isthathglewhichthecontainswiththePerpendiculartotherefle-49.&!iltg0~refra@ingSurfaceattheointofIncidence.2YbeAngleof(iZefEexionorGQefvaBion,istheAnglewhichtheLinedeJ%bedbytherePeAedorrefraAedC&y!co?ztainetbwith.tbePerpendiculartother$e&%zgorrefraRi
7、ngSurfaceatthePoirrtofIncidence.TlheSinesoflnciZ?ence,!IQejIexion,and!Qefrdl?iW,arethe$inesoftheAnglesofhcidence,CQeE%eJciolt,andCQefraEtion;DEFIN.VII.neLightwhoJ~CQaylareallal+qefrattible,Icallsim-ple,HomogenealandSimihr;a?
