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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 71, page id 1677894601:0081
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=81
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uvich its Circumterence che Diameter AC in B, and BelCCE
AC in NI, and br my reckonino che dentey oF oe Liote
in ary place B will be eo ies dentier in NI, a5 AB EO BC;
andche wtrole Lighe wichin che locter Circle BFC, Will. be
co ehe nhole Listuc richin che grCateE AFD, as the Excels ot
the Square oF. AC abore che Square oF AB, is to che Square
oF AC. AS iF BC be the ftch parE OF AC, the Lighue will bC
tour cimes denser in Bchan in N, and chewhole Lighewich-
in chelels Circle, will be corhe whole Liphe ichin che grea-
Ter, a5 nine to eiveney fire. Whence ics erident chac the
Lighe richin che less Circle, mustsrikce che sense much more
Aronoly, chan chac Faine and dilaced lighe round about be-..
cween ic and che Circumterence ot the greater.
Buc its turcher eo be noced, chac che most luminous ot
che prilmatick Colours are che Velloir and Oranse. Thele
aftect che Senles more Arongly chanall cherest together, and
nexc co chese in Arenoch are che Red and Creen. TheBluc.
compared with chese is a Fainc and dark Colour, and the In-
diso and Violet are much darker and fainter, (o that chele
compared ith che Aronger Colours are licele to be regard.
cd. Thc Images of Objects are cheretore to be placed, noc
in the Locus ot che mean retrangible Rays irtrich are in chc
contine of Creen and Blue, bur in che Focus ot chole Rays
ertrich are in che midele of che Orange and Pelloir; chere:
nhere the Colour is most luminous and fulgent, chat 15 I
che brightest Vellow, chat Xello which inclines Ore tO
Orange chan eo Green. And by che Retraction ot chele
RaYS lnhole Sines ot Incidence and Retraction in Clals:
are 25 17 and 11.) the Retraction oF Clals and Crystal For
optical ules is to be mealured. Let us theretore place the
lmage ot che Object in the Focus ofthese Rays, and all the
Tellon and Oransc Will Fall wichin a Circle, Whole Dir
mecer is abouc che 250ch parc of che Diamecer ot chie aper.
TUTE