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W+LIC~ aFter the<br />
if ,AC 3B.9) ClhsL<br />
I?&. 3 .) reprefent a Glafs fpherically Convex,on<br />
jmth ii&s (ufually called a Lens, fuch as is a Burn7<br />
ing-glafs, or Spettacie-glafs, or an QbjeEt-glafs oE<br />
a T’elefcope) an& it be required to know hog<br />
Light falling upon it froni any lucid. point Q<br />
fl~ll be refratted, let QM reprefent a Fay<br />
f&-g upon any point 754 of its fir8 fpherica!.~<br />
Surface AC B, and by ere%iing a Perpendicular<br />
to the GM at the point &I9 find the firfi refraAed<br />
way MN by the Proportion of the<br />
Sines 17 to IX. Let that Kay in going out of<br />
the ‘Glai‘s be incident upon ‘N, and, then find<br />
the fccond refiaQed Wa.y N 4 by the Proportion<br />
of the Sines 1.1 to 1.7. And after the fame<br />
manner may the RefraAion be found when the<br />
Lens is Convex* on one fide apd Plane or Conqve<br />
pp the other, or Conqwe onbath fides.<br />
A x,<br />
VT<br />
’ Homogerzed~ Rays wbicb ~%rdv fro%V JeverdQ<br />
Pffints oj‘my O&e&~ dffdf~kkpc~~elzdic~z~r~ o?<br />
~Z~~~o~~~r~e;azdic~~~~r~ on dy rejeti&g or refrd@7,<br />
&.zg‘PAwe or &&ricak $Wfdce, J?!?a& afterr&ards.<br />
&k-wgefi-am fo mzny other Fpints, or be 2?bn&e~<br />
ifibfo ?m.my other.Lhz~.r,oi- comqrge- to fi mazy olO?er<br />
Poilzrr-S,. e+7er,a~ctirate& or w$bozdi my /%?~Cbh<br />
error. Ad the &we h&g .a~$,! htipp~~~~ il;” the<br />
&zzs be rey?eAsd or refim?ed f&xceJhchy t$y .PL.,A~<br />
qs r6ree or mop i?f&& or @heriqd Sm-facm,<br />
The Point from v7hich &~ys diverge or to<br />
. P;G’hich the cpnvesge may be called their FOCM.<br />
-@cl the % iocus of the incident Rays being gi- *<br />
??:I~ th+t of the re’fle&ed .b., 4, q refraCted _. ..’ ones maIT<br />
Pe-
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