Opticks; or, A treatise of the reflections, inflections and colours of light (1718)
Newton, Isaac, Sir, 1642-1727 · London : Printed for W. and J. Innys, Printers to the royal Society, at the prince's-Arms in St. Paul's Church-Yard · leaf 365
isCryllal, it becomes divided into two beams bymeans of the fame double Refraftion. Whichbeams are of the fame Colour with the incidentbeam of Li;:,ht, and feem equal to one anotherin the quantity of their Light, or very nearlyequal. One of thefe Refradlions is performdby the ufualRule of Opticks,… … Let ADBC reprefent the refrafting Surface of [ 331 ] of theCryllal, C the biggeft folid Angle at thatSurface, GEHF the oppofite Surface, andCKa perpendicular on that Surface. This perpen-dicular makes with the edge of the Cryilal CF,an Angle of 19 Degr. 3. Join KF, and in ittake K L, fo that the…
Optics
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