A condensed course in motion picture photography ([1920])

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THE NATURE OF LIGHT looks gray in comparison to what is called Chevreurs black, which is the darkness of the mouth of a dark cavern or a hole in a large box lined with black velvet. If the object reflects only red all the other colors are absorbed ; if only yellow is reflected, then all others are absorbed. Again, if we use, as our incident light, any particular color of light Fig. 8. When light strikes a smooth reflecting surface such as a mirror or a pool of still water it is reflected back at the same angle at which it strikes or in more scientific terms the angle of reflection N, C, B in figure 8 is equal to the angle of incidence A, C, N, both angles being measured from a line perpendicular to the reflecting surface at the point where the reflection takes place. These two angles always lie in the same plane with the perpendicular line which is always at right angles to the reflecting surface. which happens to be wholly absorbed by the object, that object will appear black; if, for example, we look at a yellow and a blue flower by the yellow flame of a spirit lamp with common salt in the wick, the yellow flower appears distinctly yellow, for it does not absorb yellow light on reflection, but the blue flower looks black, for it absorbs all the yellow light and reflects none of it. We have briefly discussed four qualities of light. The entire 35