Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . ed through Telefcopeswhich have large apertures. For the Rays ofLight which pafs through divers parts of theaperture, tremble each of them apart, and bymeans of their various and fometimes contraryTremors, fall at one and the fame time upon dif-ferent points in the bottom of the Eye, and theirtrembling Motions are too quick and confufed tobe perceived feverally. And all thefe illuminatedPoints conftitute one broad lucid Point, com-pofed of thofe many trembling Points confufed-ly and infenlibly mixed wi
Opticks : or, A treatise of the reflections, refractions, inflections and colours of light . ed through Telefcopeswhich have large apertures. For the Rays ofLight which pafs through divers parts of theaperture, tremble each of them apart, and bymeans of their various and fometimes contraryTremors, fall at one and the fame time upon dif-ferent points in the bottom of the Eye, and theirtrembling Motions are too quick and confufed tobe perceived feverally. And all thefe illuminatedPoints conftitute one broad lucid Point, com-pofed of thofe many trembling Points confufed-ly and infenlibly mixed with one another by veryihort and fwift Tremors, and thereby caufe theStar to appear broader than it is, and withoutany trembling of the whole. Long Telefcopesmay caufe Objeds to appear brighter and largerthan fliort ones can do, but they cannot be foformed as to take away that confuiion of theRays which arifes from the Tremors of the At-mofphere. The only Remedy is a moft fereneand quiet Air, fuch as may perhaps be found onthe tops of the higheft Mountains above the grof- .ier Clouds. THE. THE FIRST BOOK O F OPTICKS. PART II. PROP, I. Theor. I. T%e Phczno7nena of Colours hi refraEled orrefie&ed Light are not caufed by newModifications of the Light varioufly im-frefsd^ according to the various Termi-nations of the Light and Shadow. Exper. I. The Proof by Experiments. O R if the Sun fhine into aI very dark Chamber throughan obiong hole F, [in Fig. i.]whofe breadth is tlie fixth oreighth part of an Inch, or fomething lefs j andhis beam F H do afterwards pafs firft through a H 2 very
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Keywords: ., bookauthornewtonisaacsir16421727, bookdecade1, booksubjectoptics
