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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 40, page id 1677894601:0050
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cocheincident. Then, berond these evo Prisns P placed
2 chird, uhich mighe retract chac emergene Liolc, and by
thac Retraction cast che ulual Colours oF ehe Prism upon
che oppotire Wall, or upon a Theec of Wvtrice P’aper held at
2 conreniene distance behind che Prilm For chac cefracted
Lighero Fall upon ic. ACrer this Pcurned the Paralleloxived
abone ies Aris, and Found chac irhen che contiouons Sides
oF the ervo Prilms became (0 oblique eo che incident R ays
thac chose Rays began all ot chemi ro be reflected, chole
Rars irhich in che chird Prim had suftered che creacest Re-
Fraction and painced che Paper wich riolet and bleur, rvere
tirst ot all br a cocal Rellexion calcen oue ot che cransmitred
Lighe, che rest remainins and on che P’aper paincine cheir
Colours of Oreen; Vellon, Orange, and Red as betore;
and afcermards by concinuing che morion otthe cmo Prisms,
the rest ot che Rays also br a cocal Rellexion ranisted in
order, accordino co cheir deorees ot Retrangibilier. The
Lighe cheretore irtrich emerged oue ot ehe cro Prisms is
compounded oE Rars differenely Retransible, secing che
more Retrangible Rars may be caken out of ic wrhile che
less Retransible remain. Buc chis Lighe being crajected
only chrouoh che Parallel Superficies ot che crro Prisins, it
ic suttered any change by che Retraction ot one Superficies
ic lost chat impression by the concrary Retraction of che
other Superficies, and (o being restored eo ies pristine con-
sticution became ot che lame nacure and condirion as ac Erst
betore ils Incidence on chose Prilms; and cheretore, betore
its Incidence, ias as much compounded of Rays differenelr
Retrangible as atcerrards.
Illustration. In che 22th Figure AB C and B CD are che
the cruo Prilms cied cogecher in che form ot a Parallelo-
piped, cheir Sides B C and CB beins contionous, and
cheir Sides AB and C D Parallel. And FIY K is the chird
Prilmm.
18. 22.