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 #:
00058
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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THE NATURE OF LIGHT with a lens covering practically the same range as the prisms as in Figure No. ii. We find that the lens also gathers all of the rays as the prisms did and refracts them again to the same point so that we can consider the lens as a number of prisms rounded off into a single piece, or speaking still more exactly, This is the same as Figure 10 with the proper curved surfaces substituted for the angular surface of the joined group of prisms. Fig. 12. If we take two luminous points, A and B, we find that the lens will form images of these two points as a and b. The point A being on the principal axis of the lens its image will be formed at a, also on the principal axis any motion of B will cause a diametrically opposite motion in b. that the lens is a continuation of an infinite number of prisms, the flat surfaces of which are too small for the eye to detect. This infinite number of surfaces, or points, we find ranges itself into the segment of a circle. This refraction of rays emanating from a point back to a point again is termed a "point of focus." If we now take two luminous points at the same distance from 39