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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 84, page id 1677894601:0104
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84
Stracto, and the retractions oF the Prisim in aII these
cales remained the lame.
AZ PF R. TTI.
Such another Fxperiment may be more casily tricd
a5 Follos. Let a broad beam ofthe Suns Light comine
into a dark Chamber throuh a HTole in the WVindon
But De refracted by a larse Prim ABC, wrhole re
Tractins Ansle C. is more than 60 degrees, and (o loon
a5 it comes out of the Prilm let it tail uxon the irhite
PapeF DF. glered upon a sit plane, and this Lisht
Wrhien the Paper is perpendicular to it, 25 tis seprelen-
ted in DF, Will appear pertectis irhite upon the Paper,
but irhien the Paper is very much inclined to it in tuch
a manner a5 to keep alirars parallel to the Axis of the
Prism, the erhiteness ot the wrhole Lishe upon the
Paper ill accordins to the inclination ot the Paper
this ar, or that war, chanse cither into vellor and
red, a5 in the posture des or into blue and violet, a5
in thepolture oc. And if the Light betore it fail upon
the Paper be tvice refracted the Came ray by tmo pa-
rallet Prisms, these Colours rill become the more con-
Spicuous. FTere alI the middle parts oF the brond Beam
OFwrhite Light prhich fell upon the Paper, did rithout
any contine ot hadtor to moditr it, become coloured
aII over rith onc unitorm Colour, theColour beins al-
ays the tame in the middte ot the Paper as at the
cdges, and this Colour changed accordinq the rarious
obliquitr ot the retlectins Paper, without any chanse
in the retractions or Bado, or in the. Liont which
Fell uxon the Paper. And theretore these Colours are
Fig. 3.