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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 3, page id 1677894601:0013
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DEFFN. IV.
The Angle of Incidences ls that Anele Which the Line described
by the mnula a cous mith the Perpendicular to the reste-
Eting or refractinq Surface at the Point of Incidence.
DF F IXI. V.
The An LGunh or Refraction, is the angle nhich the
Line described by the reflected or refracted Ray containeth with
the Perpendicular to the reftectine or refractine Surface at the
Doint of Incidence.
D E F IN. VI.
The Sines of Incidence, Reftexion, and Refraction, are che
Sines of the angles of Incidence, Restexion, and Refraction.
DE FINT. VII.
The Lighe mhose Rays are all alike Refransible, T call Sim-
ple, FTomozeneal and Similar; and that whose Rays are some
more Refransible than others, I call Compound, FLeterozeneal and
Dissimilar. The Former Lighe I call Hlomogeneal, noc
because I vould attrm it (o in all respects; buc because
the Rars which aorec in Retrangibiliey, aoree ac least in
all those their ocher Properties. Which I consider in che
Follomins Discourse.
DE FINT. VIII.
The Colours of FTomoreneal Liebts, L call Frinar), LLM
reneal aud Simple; and those of Fleterozeneal Lichts, Leterore
neal and Compound. For chele are alirars compounded ot
che colours of Homogeneal Lighes; a5 will appear in che
Tollomins Discourse.
XI.