Opticks: or, a treatise of the reflexions, refractions, inflexions and colours of light / Also two treatises of the species and magnitude of curvilinear figures.

Newton, Isaac, 1642-1727.

Date:: 1704

Credit: Opticks: or, a treatise of the reflexions, refractions, inflexions and colours of light / Also two treatises of the species and magnitude of curvilinear figures. Source: Wellcome Collection.

53/406 (page 43)

$[43 ] refradled Light O T vaniflies at Tjthe lefs reftaded Light Nt will become encreafed whilft the more refraded Light at p receives no further encreafe. And as the trajeded Beam M O in vaniflhing is always of fuch a Colour as ought to refult from the mixture of the Colours which fall upon the Paper PT, fo is the reflected Beam MN al¬ ways of fuch a Colour as ought to refult from the mix¬ ture of the Colours which fall upon the Paper p t. For when the moft refrangible Rays are by a total Reflexion taken out of the Beam MO, and leave that Beam of an Orange Colour, the excefs of thofe Rays in the refledled Light, does not only make theViolet, Indigo and Blue at p more full, but alfo makes the Beam M N change from the yellowiflh Colour of the Sun’s Light, to a pale white in¬ clining to blue, and afterward recover its yellowifh Co¬ lour again, fo foon as all the reft of the tranfmitted light MOT is refle<fl:ed. Now feeing that in all this variety of Experiments, whether the trial be made in Light reflected, and that either from natural Bodies, as in the firft and fecond Experiment, or Specular, as in the Ninth 3 or in Light refra^ed, and that either before the unequally refracted Rays are by di¬ verging feparated from one another, and lofing their white- nefs which they have altogether, appear feverally of feve- ral Colours, as in the fifth Experiment 5 or after they are feparated from one another, and appear Coloured as in the fixth, feventh, and eighth Experiments 3 or in Light tra- je(5led through Parallel fuperficies, deflroying each others Effects as in the i oth Experiment 3 there are always found Rays, which at equal Incidences on the fame Medium fuf- fer unequal Refra^ions, and that v/ithout any Iplitting or dilating of Angle Rays, or contingence in the inequality of the Refractions, as is proved in the fifth and fixth Ex-$