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November, 1926
AMERICAN CINEMATOGRAPHER
Twenty-one
"Monochromatic'1 is a word derived from the Greek words monos, sole, and chroma, color, that is to say: light of one color.
Substances that readily permit the transmission of light are called transparent. Substances that do not permit the transmission of light, are called opaque.
Perfectly transparent, as well as perfectly opaque bodies, do not exist. Consider, for instance, water as a highly transparent body. A sufficient quantity of water is quite impenetrable by light, and on the other end, if we reduce gold, the most ductile of opaque bodies, to a very thin leaf, we notice that it transmits green light.
These facts are well in accord with the undulatory theory, which states, that ether exists between the molecules of all substances.
Other substances such as ground glass, porcelain, etc., transmit light, but are not transparent in the common sense of the word, as one cannot see objects through them. These substances are called translucent and the phenomena is caused by the diffusion and scattering that light undergoes in the interior of these substances.
Calling media the subtances that transmit light, we can readily understand, that the velocity of light within them, is regulated by their molecular composition. We can then conclude that "A ray of light travels in a straight line in a medium whose composition is equal in all its parts, but its velocity varies according to the density of the medium/'
A ray of light, will then travel at its maximum velocity in the medium vacuo. Its velocity will be less in the medium air, still less in the medium glass, less yet in the medium diamond, which is the densest of all transparent media.
l r^ . sr% r~\ r\
\ h \y J \ J
W4 R
Fig. 1.
L equals Luminous point.
R equals Receptive point.
Straight line LR equals geomi
•trical conception of
ray.
Curved line LR equals wave
undulation.
Direction . from left to right as pointed by arrozus.
Supplied as $^A special equipment on DeVry and other M. P. Cameras
4 « «
Since 1884.
manufacturers of
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4 in. Iris Combination and Sunshade
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