To: Clyde W. Tcmhaugh
From: H. B. Van Horns
Subject: Standard notation when referring to optical systems
ie agreed upon the following standard notation in our conference of
21 October 1950.
All points in optical systems Bill be designated by capital letters
and all distances between points with lower case letters. Lenses will
be designated with L, mirrors with M, the film plane with A, and the
principal planes with B. Points in the object space locating the
object and object distances will be designated with P and p respectively.
In the image space,the position of the image and the image distance will
be given by Q and q, respectively. Focal points and focal distances will
be designated by F and f respectively.
In considering a system with mere than one element and tracing the light
from the object to the image, all quantities referring to the first
element encountered will bear the subscript one, all those referring
to the second will have the subscript two, etc. All quantities referring
to the principal planes of the combination will have no subscript and
all those referring to the simple equivalent lens will have the subscript
NMSU Department of Astronomy: Clyde W. Tombaugh Papers
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Ms0407pp082005_0010001.tif
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Scan produced from physical item held by the NMSU Library Archives & Special Collections Department
Type
Text
Format
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Language
eng
OCR
To: Clyde W. Tcmhaugh
From: H. B. Van Horns
Subject: Standard notation when referring to optical systems
ie agreed upon the following standard notation in our conference of
21 October 1950.
All points in optical systems Bill be designated by capital letters
and all distances between points with lower case letters. Lenses will
be designated with L, mirrors with M, the film plane with A, and the
principal planes with B. Points in the object space locating the
object and object distances will be designated with P and p respectively.
In the image space,the position of the image and the image distance will
be given by Q and q, respectively. Focal points and focal distances will
be designated by F and f respectively.
In considering a system with mere than one element and tracing the light
from the object to the image, all quantities referring to the first
element encountered will bear the subscript one, all those referring
to the second will have the subscript two, etc. All quantities referring
to the principal planes of the combination will have no subscript and
all those referring to the simple equivalent lens will have the subscript
