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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 41, page id 1677894601:0051
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Prism, by which thesuns Lighe propagated chrough che
hole F into che dark Chamber, and chere passine chrouoh
those Sides oF the Prims AB, BC, CB and CD, is retra-
ctedat Ocorhenhite Paper P P, Falline chere parrly upon
e by a creater Retraction, parely upon Y by a less Retra-
ction, and parely upon R and ocher intermediace places by
intermediare Refractions. By turnins che Parallelopiped
ACBD abouE ies Aris, accordins eo the order of the L er-
TerS A, C, D, B, at lenoch when che contiouous Planes BC
and CB become (ufficientlr oblique co che Rays IM,
irhrich are incidene upon them ac MI, there ill ranish co-
callu ont ot che retracted Liohe OP T, Arst oF all che most
retracted RaysOP, (the rest OR and O I remainins 25
before) chen che RarS OR and orher intermediate ones,
and lastlr, che least retracted RayS OT. For When che
Plane BC Decomes sufficientty oblique eo the Rays inci-
dent upon ic, chose Rays will bcoin eo be tocally reftect-
ed by ic comards N; and first che most Retrangible Rays
will be cocallr reflected (as mas explained in the precedins
experiment) and by consequence must first disappear ac P,
and afcermards che rest as cher are in order cocally rehect-
ed eo N, cher must disappear in che lame order ac R and
T. S0 chen che Rays irhich at O sufter che grearest RC-
Fraction, may be caken onc ot che Lighe MIO whilst the rest
ofthe Rays remain in ic, and cherefore that LighE MO is
Compounded of Rays difterently Retrangible. And be-
cause che Planes AB and CD are parallel, and cheretore
by equal and concrary Retractions destroy one anothers
Ffects, the incident LighE F NI must BC oF che same kind
and nacure wich the emergent Lighe MO, and cheretore
doch also consist ot Rays difterenely Retrangible. These
erro Liohes FMI and MO, betore che most retrangible RarS
are separated oue oF che emersent Lighe MIO agrec in C0-
TOur.