Brainy Quote

 [ 8 ] a lot of when the celebrity manner, if ACBD (in Fig. three ] reprefent a Glafs ſpherically gibbous on each each (uſually referred to as a Lens, ſuch as could be a could be a, or Spectacle glaſs, or AN Object glaſs of a Teleſcope) and or not it's needed to understand however lightweight falling upon it from any lucid purpose Q ſhall be refracted, let Q M repreſent a Ray falling upon any purpose M of its firſt ſpherical Surface ACB, and by building a Perpendicular to the Glaſs at the purpose M, notice the firſt re- fracted Ray M N by the Proportion of the Sines seventeen to eleven. Let that Ray in going out of the Glaſs be incident upon N, and so notice the ſecond refracted Ray weight unit by the Proporti- on of the Sines eleven to seventeen. And when the ſame manner might the Refraction be found once the Lens is gibbous on one ſide and Plane or Con- cave on the opposite, or bowl-shaped on each each. A X. VI. Homogeneal Rays that ensue feveral Points of any Object, and fall sh...

 [ 7 ] Circumference in E, and joyning metallic element, this Line metallic element fhall be the road of the refracted Ray. For if E F be let fall sheer on the Line PQ, this Line E F fhall be the trigonometric function of Re- fraction of the Ray metallic element, the Angle of Refraction being ECQ; and this trigonometric function E F is adequate to DH, and conſequently in Proportion to the trigonometric function of Incidence AD as three to four. In like manner, if there be a Priſm of Glaſs (that could be a could be a with 2 Equal and Parallel Triangular ends, and 3 plain and well poliſhed Sides, that meet in 3 Parallel Lines running from the 3 Angles of 1 finish to the 3 Angles of the opposite end) and if the Refraction of the sunshine in pafling croſs this Priſm be deſired: Let ACB [in F'ig. 2.] repreſent a Plane cutting this Priſm tranverfly to its 3 Parallel lines or edges there wherever the sunshine the sunshine it, and let D E be the Ray inci- dent upon the firſt ſide of the Pr...

 [ 6 ] Refraction be created out of Air into Water, the sin of Incidence of the red light-weight is to the sin of its Refraction as four to three.  If out of Air into Glafs, the Sines square measure as I7 to II. In light-weight of alternative colors the Sines produce other Proportions: however the distinction is FO very little that it want feldom be confidered. Suppofe so, that R S [ in Fig. I. ] repre-fents the Surface of ftagnating Water, which C within the purpose of Incidenec within which any Ray coming back within the Air from A within the Line A C is mirrored or refracted, and that i would understand whither this Ray fhall follow Reflexion: I erectupon the Surface of the Water from the purpose of Incidence the Perpendicular C P and turn out it downwardly to letter, and conclude by the firft Axiom, that the Ray when Reflexion and Re-fraction, Fhall be Found fomewhere within the Plane of the Angle of Incidence A C P made. I Let fall so upon the Perpendicular C P the sin of...

 [ 5 ] A X. I. T B E Angles of Reflexion, and Refraction, lie one and additionally the celebrity Plane with the Angle of Incidence. A X. II. The Angle of Reflexion is up to the Angle of Incidence. A X. III. If the Refracted Ray be came back directly back to the aim of Incidence, it fball be re-fracted into the road before defcribed by the in-cident Ray. A X. IV. Refraction out of the rarer Medium into the denfer, is made towards the Perpendicular, that is, of that the Angle of Refraction be lefs than the Angle of Incidence. A X. V. The mathematical function of Incidence is eitber accurately or really nearly terribly} very given relation to the mathematical function of Re-fraction. wherefrom if that Proportion be acknowledged in anybody Inclination of the incident Ray, 'tis acknowledged in all the Inclinations, and thereby the Refra-ction in all cafes of Incidence on the celebrity refra-cting Body may even be determined. therefore if the Refra-

 [ 4 ] D E F I N. V. The Angle of Refraction, is that the Angle that the road defcribed by the reftected or refracted Ray containetb with the Perpendicular to the reflective or refracting Surface at the purpose of Incidence. D E F I N. VI. The Sines of Incidence, Reflexion, and Refraction ar the Sines of the Angles of Incidence, Reflexion, and Refraction. D E F I N. VII. the sunshine whofe Rays ar all alike Refran- gible, I decision straightforward, Momogeneal And Similar; which whofe Rays ar fome additional Refrangible Than others, I decision compound, Heterogeneal and Diffimilar. the previous light-weight I decision Homoge- Neal, not becaufe i'd affirm it of altogether re- fpects; however becaufe the Rays that agree in Re- frangibility, agree at leaft altogether thofe their different Properties that I confider within the following Difcourfe. D E F I N. VIII. the colors of Homogeneal Lights, I decision Pri-mary, Homogeneal and Simple; and thefoe of Heterogencal Lights, Heterogenca...

 And therefore might Rays and Refractions be confidered, it light-weight be propagated in Associate in Nursing inftant. however be Associate in Nursing Argument taken from the AEquations of the days of the Eclipfes of jupiter's Satellites it feems that light-weight is propagated in time, Fpending in its paffage from the Sun to U.S.A. regarding feven Minutes of time: and so I even have chofen to outline Rays and Refractions in fuch general terms as might conform to light-weight in each cafes. D E F I N. III. Reflexibility of Rays, is their Difpofition to be mirrored or turned back to the celebrity Medium from the other Medium upon whofe Surface they fall. And Rays square measure a lot of or lefs reflxible, that square measure turned back a lot of or lefs eafily. As if light-weight pafs out of Glafs into Air, and by being inclined a lot of and a lot of to the common Surface of the Glafs and Air, begins at length to be completely mirrored by that Surface; thofe forts of Rays that at l...

  DEFINITIONS B r the Rays of sunshine I underftand its leaft elements, and thofe additionally Succeffive within the fame Lines as modern in feveral Lines. For it's manifelt that lightweight confifts of elements each Succeffive and Contemporary; becaufe within the fame place you'll ftop that that comes one moment, and let pafs that that comes prefently after; and within the fame time you'll ftop it in anyone place, and let it pafs in the other. For that a part of lightweight that is ftopt can't be the celebrity therewith that is let pafs. The Leaft lightweight or a part of lightweight, which can be ftopt alone while not the reft of the sunshine, or propagated alone, or do or fufter any factor alone that the reft of the sunshine doth not or fuffers not, I decision a Ray of sunshine. D E F I N. II. Refrangibility of the Rays of sunshine, is their Difpofition to be refracted or clothed of their approach in paffing out of 1 tranfparent Body or Medium into another. And a lar...