Third Dimension Movies And E X P A N D E D Screen (1953)

Record Details:

Title:
Third Dimension Movies And E X P A N D E D Screen
Date:
1953
Publisher:
Cameron Publishing Company
Volume:
Third Dimension Movies And E X P A N D E D Screen
Leaf #:
00071
Language:
English
Collection:
Books
Format:
Books
Contributor:
Universal Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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68 THREE-DIMENSIONAL MOTION PICTURES lens and the points created by the imaginary prolongation of the rays refracted by a divergent lens are called the foci of the lens. As in the case of mirrors, principal and conjugate foci are formed according as the rays emanated by the object are par allel to the axis or inclined to it. Paraxial rays parallel to the axis may be incident upon a lens striking either one or the other of its two surfaces. In both cases, one particular ray will always be found which coin- cides with the axis and which will be transmitted through the lens without suffering refraction. All other paraxial rays parallel to this principal ray and traveling from left to right (traced as full lines in the figure) will be so refracted by the lens that they will meet at a point /' of the axis which is called the second principal focal point of the lens and which lies behind the lens itself. Vice versa, paraxial rays parallel to the axis proceeding in a direction from right to left (traced as broken lines in the figure) will, after refraction, meet at a point on the axis in front of the lens and form the real first principal focal point of the lens which is designated by the letter /.