Opticks, or, A treatise of the reflections, refractions, inflections and colours of light (1721)
Newton, Isaac, Sir, 1642-1727 · London : Printed for William and John Innys at the West End of St. Paul's · leaf 341
of thisCryftal, it becomes divided into two beams bymeans of the fame double Refradion. Whichbeams are of the fame Colour with the incidentbeam of Light, and feem equal to one anotherin the quantity of their Light, or very nearlyequal. One of thefe Refradions is performdby the ufual Rule of… … Let A D B C reprefent the refrading Surface of C 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 Cryital C F,an Angle of 19 Degr. 3^ Join KF, and in ittake K L, fo that…
Optics · Light
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