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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 38, page id 1677894601:0048
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cted by ic eo Fall attermards upon a Pheec ot white Paper
placed ac lome distance behind ic, and chere by chat RC-
Fraction eo paine the usual Colours of the Prism. And
then causine the Arst Prism eo be curned about ies Aris 2S
abore, loblerred char when chose Rays irtrich in chis Prism
had suftered the grearest Retraction and appeared ot a ble
and violet Colour began to be cotallr reflected, the blen
and violet Liohe on ehe Paper erhich as most retracted
in che second Prism receired a sensible increale above chac
oF the red and vellon, irtich was least retracted; and
afcermards wrhen che rest of che Lighe which as orcen.
vellor and red besan eo be cocallr reflected in he Arst
Prilm, che lighe of chose Colours on che Paper receired as
rrent an increale a5 the riolet and bler had done betore.
Whence eis manifest, chac che beam ot Liohe refected by
che Base oF che Prism, beins auomented Arst by che more
Retrangible Rars and afcermards by che less Retrangible
ones, is componnded ot Rars differeney Retrangible.
And chac aIl such refected Lighe is of che Came Nature
wich ehe suns Liohe, betore ies Incidence on che Bale ot
che Prilm, no Man erer doubced: ic beins generally al-
lored, thar Liphe by such Reflexions Cufters no Alceration
in ies Modifications and Propercies. I do noc here take
notice ot any Retractions made in the Sides of the Arst
Prilm, because che Lighe enters it perpendicularty ac the
Tirst Side, and goes ouc perpendicularty ac che second Side,
and cheretore suHers nonc. S0 then, che Suns incident
Liohe beins ot che lame cemper and consticution wich his
emersent Lighe, and che last beins compounded of Rays
differently Retrangible, che tirst must be in like manner
compounded.
Illustration. In the 2Ith Fignre, A B C is the First Prilm,
BC is Base, B and C its equal Angles ac che Bale, cach
O
5. 21.