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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 45, page id 1677894601:0055
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PROF. IV. PrOD. =
T0 separate from one another the Tleteroseneous Rays of
ta
Compound Light.
IFTF HleterogenconS Rays are in Pome meature sepa-
rated From one anorhier by the Retraction ot che
Prilm in che chird Fxperimene, and in the ffth Fxperiment
by calcing arar che Penumbra trom the Rectilinear Sides ot
the Coloured lmage, thac separation in those verr Reccili-
near Sides or Araighe edges ot the Image becomes pertect.
Buc in aIl places berween those rectilinear edges, thole in-
numerable Circles chere described, which are severally illu-
minated by Hlomogeneral Rays, by incerterins wich one
another, and beins ererr ihere commixt, do render che
Liohe Cufticiendy Compound. Buc il chele Circles, Whilst
their Cenrers keep their distances and posirions, could be
made less in Diamerer, cheir incertering one ith anocher
and by consequence che mixture of che FICcerOgeneOUS
RaYS Would be proportionally diministred. In che 23ch Fig. 23.
Figure lec AG, BFI, CT, DR, EL, FM bC the Circles
erhich (0 many fores of Rays Aorwing trom che lame Dilque
oF the Sun, do in che chird Experiment illuminate; oF aII
irtrich and innumerable octrer incermediare ones lyins in a
Continual Series beteen che erro Rectilinear and Parallel
edges ot che suns oblons Imase P P, chac Image is com-
poled as as explained in che fitch Experiment. And lec
a8, bh, ci, dk, et, fm be (0 many lels Circles lying in
a like continual series berireen erro Parallel righe Lines a f
and em with che same distances becireen cheir CenterS,
and illuminated by ehe same POrts oF RaYS, chat is che
Circle a 8 wrich the lame Pore by irhich che correspondine
Circle