Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . ed Light. The re-fieded Rays are therefore in Fits of eafy Tranf-miffion at their egrefs; v/hich would not alwayshappen, if the Intervals of the Fits within thePlate after Reflexion were not equal, both inkngth and number, to their Intervals before this confirms alfo the proportions fet downin the former Propofition. For if the Raysboth in going in and out at the firfh Surface bein Fits of eafy Tranfmiffion, and the Intervalsand Numbers of thofe Fits between the firftand fecond Surface, before a
Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . ed Light. The re-fieded Rays are therefore in Fits of eafy Tranf-miffion at their egrefs; v/hich would not alwayshappen, if the Intervals of the Fits within thePlate after Reflexion were not equal, both inkngth and number, to their Intervals before this confirms alfo the proportions fet downin the former Propofition. For if the Raysboth in going in and out at the firfh Surface bein Fits of eafy Tranfmiffion, and the Intervalsand Numbers of thofe Fits between the firftand fecond Surface, before and after Reflexion,be equal, the diftances of the Fits of eafyTranfmiflion from either Surface, muft be inthe fame prpgreffion after Reflexion as before;that is, from the firft Surface which tranfmit-ted them, in the progreffion of the even Num-. bers B O O K IL 263 bers o, 2, 4, 6, 8, (^c. and from the fecondwhich refledled them, in that of the odd Num-bers I, 3, 5, 7, &c. But thefe two Propofi-tions will become much more evident by theObfervations in the following part of S4 THE
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Keywords: ., bookauthornewtonisaacsir16421727, bookdecade1, booksubjectoptics
