Lange, David C. (David Christoph) · New York, John Wiley & sons, inc.; [etc., etc.] · leaf 67
coordinates. (Figs. 5 and 6.) 11. The true angle \vhich the Conventional Ray ofLight makes with the Coordinate Planes is 35°15 22. Theprojections of the same Ray make angles of 45° with theGL, or Coordinate Planes. CFigs. 6 and 7.) 127 A Plane of Light is any plane containing a Rayof Light. (Fig.… … Fig. 8 GENERAL PRINCIPLES 55 Indirect Rays of Light are those Rays which are reflectedback on an object from some other object. This is called,also, Reflected Light. (Fig. 1, a and b.) Diffused Light is that light which is widely scattered,and has its rays spread out in all directions from the…
Shades and shadows · Geometry, Descriptive
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