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AX. I. *<br />
I<br />
A x: .I&<br />
Tie Angle of &!ej%xion is ,eqzlak to LllJe Afigk<br />
of kidelzce.<br />
s<br />
A x. III.<br />
If the Re..raAed Ray be retzpnea dire&?Zy<br />
back to the Point ‘of hzcidetzce, it fiall be refratied<br />
into the .Ljna before de$cribedby ~%e incident<br />
Ray.<br />
ax.<br />
I-K<br />
Refrat%o?z ogt of the rarer flediwn intothe<br />
de@er, is made towards the Terp.endimlar, that<br />
Jo> fo that the AB k of Refratison be le$s thaw<br />
the Angk of Inci Lf ente.<br />
AX. v:<br />
The Sine of Incidence is eitrtjer accztratcb or,<br />
very s near& i~z a given Jiatio to the Size of Re?<br />
frat%on.<br />
J<br />
Whence ‘if that Proportion be knownin any<br />
one Inclination of the incidentRay, ‘tis known<br />
in all the Inclinations, and thereby the Refia- J<br />
&ion in all cafes of Incidence on the fame refray
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