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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 42, page id 1677894601:0214
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C42)
erhiteness, rithout any terminations oF Madons, the
retraction oF a Priim Mould make Rings oF ColourS ap-
pear, Wrhereas it ulually makes Objects appear coloured
omly there irhiere they are terminated ith Madors, Or
hare parts unequally luminous; and that it Mould inake
those Rines excccdingly distinet and irtite, althoustr
it ulually renders Objects contuled and coloured. Thc
cause ot these things rou ill understand by considerins,
that aI the Rinos ot Colours are really in the plate,
irhien riemed rich the natced kiye, althoushi by realon
ot the great breadth ot their circumterences they 10
much incertere and are blended together, that ther leem
to constitute an even wrhiteness. But wrten the rays
Pals through the Prism to the Rye, the orbits of the
several Colours in crery Ring are retracted, Pome more
than others, accordins to their degrees of retrangibility:
By erhich means the Colours on one sde oF the Ring
(that is on onc side of its Center) become more untolded
and dilated, and those on the ottier hde more compli-
cated and contracted. And irhere by a due refraction
therare (o much contracted, that the serral Rings Be-
come narrorer than to intertere rith one another, they
must appear distinct, and also wrhite, il the constituent
Coloursbe so much contracted asto be Wwholly coincident.
But, on the other side, irhere the orbit ot every Rine
is made broader by the Further untoldinq oF its CO
lours, it must intertere more with ottier Rings than
betore, and (o become less dictinct.
T0 explain this a litele Further, suppose the concen-
triek Cireles AV, and BZ, reprelent thie red and riolet
oE ans order, irhich, cogecher irith the intermediate
COIOUTS,
Eis. 7.