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 #:
00072
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 69 Although the lens chosen In the figure for the demonstration of the formation of the focal points is a biconvex it is quite evident that a similar construction will determine the foci of plano-convex lenses and convergent menisci. Concave or divergent lenses, as divergent mirrors, do not form^ real foci and these points are virtually located at the meeting of the prolongation of the refracted rays. As in the case of convergent lenses the principal foci of diver- ^p< gent lenses are formed by the refraction of the paraxial rays parallel to the axis. In the figure the light rays traveling from left to right have been traced as continuous full lines, the rays traveling from right to left have been traced as broken lines while the pro longations of the refracted rays have been traced at dotted lines. From the figure it is easily deduced that the virtual second focal point in the case of divergent lenses is located in front of the lens at /' and the virtual first focal point of the lens is to be found behind the lens at /. It is quite evident that the conjugate foci of paraxiai object- points situated either on or outside the axis and at a finite dis-