Opticks - scan from original manuscript - I. Newton

Opticks - scan from original manuscript - I. Newton - am...

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Unformatted text preview: am added Amt i, / . - _-. .A . -.. ‘ c ,- perties ok Light by Hypotheies, .but to propole and prove them by Reafon and EF:periments : In order to which , I fhall: premik the fqllowing Ddinb ‘si; Dd’ip;n in this Bd& ‘is not to explain t& J?r& tions and Axioms. ” ” 1 “. . .\. . . : .I ,‘ .. i .I ‘ . : E, E. p: I ~,. I; ,I ‘- .’ ,: ‘ I ‘ I- - ; . Q$?a?gibili$. of &be GQays of L ii ht , is their di@oj?tisn to be- ZcfraFted or turned out of their Way in pas out qf one trm&. parent Body or Medium into amher. A?jd a greater or lefs @p. fiargibili fy of Cf y a s, is their. D@oJtiou to be ttmed more or /es+. out of their Way in like Ihcidemes 071 the lame Medium. h&tfieM maticians ufilally confider the Rays of Light to bc Lines,. reaching from the luminous Body CO the body illuming- ted, and the refra&ion of tlhoSe Rays to bc the bending or breaking oif thofe Lines in their pafing out of one Me- dium into another. And thus may Rays and RcfiaC‘t;ions be confidered, if Light be propagated in an infIxnt, But: by an Argument taken from the rEquations of the rifxzes of the Eclipfes of ‘$/$u.‘s Sate&es it fccms that Light is propagated in time, fpending in its pafige fixrrr the Sun to us about Seven Minutes of time : And thercf?xxz 1 Irave chofen to define ,Rays and Refia&ons in ftlch gancral terms as may agree to. Light in both caks, I3 E F I Es. XII. xi&i&y of C!(y a s, is tlvir Di[p,/;tio?l to Ge turw? h&k [tit0 de fall, Mediunz from any other Mediium idpon tpbo/^e Sayfdce ;Eh Aitd qays are more or le Jack more or hJs easily. rq%xible , whi& nre retf4rn AS i i/” Light pafs our of c%& into Air, and by being inclined more and nxxc to rhe coml man Surface of the GM and Air, begins at length to be totally refle&ed by that Surf&x 5 thofo forts of Rays which at like Incidenccs are refle&ed mofi copiously 3 or by in& clining the Rays begin Soon& CO be rurally rcfle&ed, are m.ofi i,eflexiblc. . D E* cidence3 is that hgle which the 49 contains with the Perpendicular to the refle- .&!iltg 0~ refra@ing Surface at the oint of Incidence. 2Ybe Angle of (iZefEexion or GQefvaBion, is the Angle which the Line deJ%bed by the rePeAed or refraAed C&y !co?ztainetb with .tbe Perpendicular to the r$e&%zg or refraRing Surface at the Poirrt of Incidence. Tlhe Sines of lnciZ?ence, !IQejIexion, and !Qefrdl?iW, are the $ines of the Angles of hcidence, CQeE%eJciolt, and CQefraEtion; D E F I N. VII. ne Light whoJ~ CQayl are all al+ qefratt ible, I call sim- ple, Homogeneal and Simihr ; a?zd that wh e Cf$dy:s are* Jbme P more qefralzgible than others, I call Compound,’ Heterogeneal and Bi@niEar. The former Eight I call Homogeneal, not becauk I would affirm it fo in all refpe&s j bur becaufe the: R,ays which agree in Refi+ngib?i’lky , agree at le& in all thofe their other Properties- Which I’ co&&x in’ the fgl[Qw&g D.$co,urfs....
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Opticks - scan from original manuscript - I. Newton - am...

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