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Astronomical Optics, 2nd Edition
book

Astronomical Optics, 2nd Edition

by Daniel J. Schroeder
September 1999
Intermediate to advanced content levelIntermediate to advanced
478 pages
21h 54m
English
Academic Press
Content preview from Astronomical Optics, 2nd Edition
4.3.
Reflecting Conies and Finite Object Distance 57
We show in Chapter 10 that this image, the one midway between paraxial and
marginal focus, is the one with the minimum root-mean-square (rms) wavefront
error.
From our discussion we see that the diameter of the circle of least confusion is
\r'/AR^\
when the object is at infinity. At the mirror this blur subtends an angle a
where
a = ?/2R^ =
1/128F^
(4.2.9)
As the focal ratio F increases, the subtended angle a decreases. A point is
reached, however, where the image diameter no longer decreases but reaches the
limit set by diffraction according to Eq. (3.7.1). The smallest F for which a
spherica ...
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Publisher Resources

ISBN: 9780126298109