Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . THE FIRST BOOK O F OPTICKS. PART I. , Y Delign in this Book is not to ex-plain the Properties of Light by Hy-pothefes, but to propofe and provethem by Reafon and Experiments:In order to which I ihall premife thefollowing Definitions and B DEFI- B O P T I C K D E F I N. I. T the Rays of Light I under/land its leafiTartSy and thofe as well Siiccejive in thefame Lines, as Contemporary in feveral it is manifeft that Light confifts of Parts,both Succeflive and Contemporary
Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . THE FIRST BOOK O F OPTICKS. PART I. , Y Delign in this Book is not to ex-plain the Properties of Light by Hy-pothefes, but to propofe and provethem by Reafon and Experiments:In order to which I ihall premife thefollowing Definitions and B DEFI- B O P T I C K D E F I N. I. T the Rays of Light I under/land its leafiTartSy and thofe as well Siiccejive in thefame Lines, as Contemporary in feveral it is manifeft that Light confifts of Parts,both Succeflive and Contemporary j becaufe inthe fame place you may ftop that which comesone moment, and let pafs that which comes pre-fently after; and in the fame time you mayHop it in any one place, and let it pafs in anyother. For that part of Light which is ftoppdcannot be the fame with fhat which is let leafl Light or part of Light, which maybe floppd alone without the reft of the Light,or propagated alone, or do or fuffer any thingalone, which the reft of the Light doth not orfuifers not, I call a Ray of Light. D E F I N. IL Refrangibility of the Rays of Light, is theirT>ifpofition to be refraBed or turned out of theirWay in pafjing out of one tranfparent Body orMedium into another. And a greater or lefs Re-frangibility of Rays, is their Difp
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