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

Record Details:

Title:
A condensed course in motion picture photography
Date:
[1920]
Author:
New York Institute of Photography
Publisher:
New York, New York Inst. of Photography
Volume:
A condensed course in motion picture photography
Leaf #:
00047
Language:
English
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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HISTORY O F CINEMATOGRAPHY light falling upon A, or conversely, the intensity of the light falling upon A is four times the intensity of light on screen B. This law of illumination must be taken into account very particularly where artificial illumination is used, for if it takes a cer Fig. 5. When a ray of light strikes another medium of greater or lesser density than the one it is leaving then, unless it strikes exactly perpendicular to the surface of the new medium^ it will be bent or refracted. Figure 5 shows a ray passing through a block of glass and suffering two refractions, one upon entering and one upon leaving. In this case the two surfaces being parallel, the first refraction is neutralized by the second and the light ray continues in its original direction slightly displaced but parallel to its original course. tain number of lights to illuminate a certain small set properly, it will require four times as many lights to properly illuminate a set which is only twice as large. Therefore, it is practically impossible to artificially illuminate a very large set since the limit of the practical number of artificial lights is soon reached. When light strikes an object, part of it is reflected or thrown 32