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

Page scan 00070 from Third Dimension Movies And E X P A N D E D Screen

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 #:
00070
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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THREE-DIMENSIONAL MOTION PICTURES 67 thinner at their centers along the axis than at their edges, in opposition to convergent lenses the characteristics of which are diametrically opposite as has been shown. Lens a is called biconcave because both of its faces are con cave, that is they are both part of hollow spheres. The radii of curvature of the two faces may be equal in length or they may be of different magnitude and it is then evident that by varying the radii of curvature the power of divergence of the lens may be controlled at will. Lens b is called a plano-concave lens, one of its faces being concave and its radius having any desired finite length while the other face is a plane and can, of course, be considered as a curved surface having a radius of infinite length. Lens c is called a divergent meniscus because of its similarity to the crescent shaped moon. Its faces are both curved sur faces and may have any desirable finite radius of curvature. The same notations used in connection with convergent lenses apply to divergent ones and the symbols and signs in the figure do not require any further explanations. FOCAL POINT OF LENSES The points to which converge the luminous rays emanated by a single object point after refraction through a convergent