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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 109, page id 1677894601:0285
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=285
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l109
alter reflexion are equal in lensth and number to the
fits ofthe Came cay rithin che Cilals Detore its incidence
on the retlectine surtace; and theretore lince aIl therayS
OF aII Ports at their entrance into the Cilals vere in a tut
ottransmistion, ther ivere allo in a tit of transmission at
theis returnins to the lame Curtace alter refexion; and
by consequence vere transmitted and vent out to the
Wrtrite Rins on theChart. Thisisthe realon why chat
Rins ras ol the Came bionels in aIl the Colours, aud
irhy in a mixture oE all ic appears wrhite. But in FaYS
irtrich are retlected in other Angles, the interrals ot che
ts of the least retransible beins createst, make the
Rinos oftheir Colour in their proerels from this irhite
Ring, either outards or inmards, increase or decrease
by the greatest Ceps; (0 that the RingsOF this C olour
rithout are greatest, and rithin least. And thisisthe
reason wrhr in the last Obserration, When the Specu-
lum ras illuminated writh white Lisht, che exterior
Rings made by alI Colours appeared red without aud
blue richin, and the interior blue without and red
Writhim.
Thele are the Phaenomena oF thick CONVeXO COnCaVC
plates oF Gila(s, vrhich are every wrhrere oFthe lamE
thicknels. There are vet other Phaenomena Wrhen thele
plates are a little thieker on one side than on the
other, and others irhen the plates are more or lels con-
care than ConVex, Or plano Conrex, or double- COnvex.
For in all these cases the plates make Rings OFC OIOUTS,
but alter various manners; all trich, 10 tar a5 lhave
yet obserred, tollon from the Propolitions in the end
oFthe chird part of this Book, and (0 conspire to con
tem the truth oE. those Propolicions. But che Phaeno
MEMa