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
Catalogue details

Licence: Public Domain Mark

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.

    52/406 (page 42)
    [42]’ Tour, and' in all other properties fo far as my obfervation reaches, and therefore are defervedly reputed of the fame Nature and Conftitution, and by confequence the one is compounded as well as the other. But after the moft Re-^ frangible Rays begin to be totally refleaed, and thereby feparated out of the emergentLightMO, that Light changes its Colour from white to a dilute and faint yellow, a pretty good orange, a very full red fucceffively and then totally vaniflhes. For after the moft Refrangible Rays which paint the Paper at P Avith a Purple Colour, are by a total re^ flexion taken out of the Beam of light M O, the reft of the Colours which appear on the Paper at R and T being mixed in the light M O compound there a faint yellow,, and after the blue and part of the green which appear on the Paper between P and R are taken away, the reft which, appear between R and T (that is the Yellow, Orange, Red and a little Green) being mixed in the Beam M O com¬ pound there an Orange 5 and when all the Rays are by re¬ flexion taken out of the Beam MO, except the leaft Refran¬ gible, which at T appear of a full Red, their Colour is the fame in that Beam M O as afterwards at T, the Re- fradion of the Prifm HJK ferving only to feparate the differently Refrangible Rays, without making any alteration in their Colours, as flhall be more fully proved hereafter. All which confirms as well the firft Propolition as the fe- cond. Scholium. If this Experiment and the former be conjoyned Eg. 22. and made one, by applying a fourth Prifm VXY to re- fradl the reflected Beam MN towards tp, the conclufion. will be clearer. For then the light Np which in the 4th Prifm is more refradfed, will become fuller and ftronger when the Light OP, which in the third Prifm HJK is. more refrailed, vanifhes at P 3 and afterwards when the lefs- refracted.