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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 56, page id 1677894601:0066
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=66
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ips R ectilincar Sides, did hen produced pals exactly chrouoh
the midale ot thac white round Image S. And when che
Refraction of the second Prilm ras equal eo the Retraction
oF chetirst, che retractins Angles ot chem boch being about
60 decrees, che Axis ot che spectrum 3P 3t made by chac
Retraction, did ihen produced pals allo chroueh che mid
ile of che lame irtrice round Image S. Buc When the RC
Fraction of che sccond Prilm as lels chan chac of the Arst,
che produced Axes oF the Spectrums FP Or 2+ 2p made
by chat Retraction did cur che produced Axis oF the SpC-
ctrum TP in che Poines m andn, a licele berond che Cen-
cer ot chac nhice round Image S. Whence the Proportion
OFche. Linc 3+T eo che Linc 3 p P was a licele orcarer chan
hePrOpOrtiOn OF 2FT +02 pP, and chis Proporcion a licele
oreater than chat OFFT eO pP. Now when che Lighe ot
che Spectrum P TFalls perpendicularty uxon the W all, chosc
Lines 3FT, 3PP, and 2F l, 2P P and+P, pP, are che l’an-
genes of che Retractions; and cheretore by chis Experiment
che Proportions of the langenrs of che Retractions are ob-
cained, trom Whence che Proportions ot chesinesbeins derir-
ed, cher come out equal, (0 taras br viering the spectrums
and ulins lome Machemacical realonins I could Estimate.
For I did noc make an Accurace C omputation. S0 then
che Propolition holds erue in every Ray apart, (0 Far 25 ap-
pearsby Experiment. And thac ic is accurately true may
be demonstraced uxon chis Suppolicion, That Bodies refract
Zicht by acting upon its Rays in Lines Perpendicular to their
Surfaces. Buc in order eo chis Demonstration, I muct di-
Cinguith che Mocion ot erery Ray into tuo Mocions, che
one Perpendicular to the retractins Surtace, the other Pa-
rallel coic, and concernins che Perpendicular Mocion lay
donn chetollorins Propolition.