Opticks : or, A treatise of the reflections, refractions, inflections and colours of light (1730)
Newton, Isaac, Sir, 1642-1727 · London : Printed for William Innys at the West-End of St. Paul's · leaf 339
al,it becomes divided into two beams by means of,the fame double Refraction. Which beams are ofthe fame Colour with the incident beam of Light,and feem equal to one another in the quantity oftheir Light, or very nearly equal. One of thefeRefra<flions is performd by the ufual Rule of Op-ticks,… … H ^ Let ADBC reprefent the refrading Surface of\ BOOK III. 331 of the Cryftal, C the biggeft folid Angle at thatSurface, GEHF the oppofite Surface, and CKa perpendicular on that Surface. This perpen-dicular makes with the edge of the Cryftal C F,an Angle of 19 Degr. 3. Join KF, and in ittake KL, fo…
Optics
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