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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 121, page id 1677894601:0141
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=141
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PROD. VITI. PROB. TTI.
By the discovered Properties of Zisht to explain the
Colours made by Prisms.
L et ABC represent a Prilin refractins the Light OF Fig. 12.
chesun, irhicti comes into a dark Chamber through a
HTole F e alnost as broad as the Prilm, and let MIN
reprelent a irtrite Paper on wrhich the retracted Light is
Cast, and suppose the most retransible or deepest violet
makins cays FaIl upon the space PX, the leas retran-
sible or decpest red- makins rays uxon the space VI.
the middle Port betreen the Indico-makins aud blue.
matcins rays upon thespace 2x, the middle Port oF che
Freenmakins rars upon the (paceRe, themidale (Ort
Detreen the vellorr-makins and orange-makrins rays
uxon the (paceSo and other intermediate COrtS upOn
intermediate spaces. For Pothe spaces upon which the
several COrts adeguatelr Fall Wrill br realon et the ditte-
rent retransibilier oF thole COrtS Be one lorver than ano-
ThET. No ifthe Paper MN De Ponear the Prilm thatthe
SpaCeS P T and r do not intertere ith one another, the
distance betrreen them T x ill De illuminated by aII
the lorts oFrars in that proportion to one another wrtrich
ther have at their very tirst comine out ot the Prilin,
and consequentlr be rvhite. But the spaces Pl and n
on cither hand, will not be illuminated by them aIl,
and theretore will appear coloured. And particularly
at P, Wrhere the outmost riolet makins rars Fallalone,
the Colour must be the decpest violet. At Cirhere thC
violet makins and indico makine rays are mixed, it
must