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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
88 5. Fermat's Principle and Abberrations
Further discussion of the image characteristics of a paraboloid is presented in
Chapter 6.
For a conic mirror with b = 0, the condition for zero spherical aberration fixes
K in terms of
m.
Setting ^3 = 0 in Table 5.2 gives the relation in Eq. (3.5.4), a
result used in Section 4.5 to establish the conic constant for the secondary mirror
of a classical Cassegrain telescope. Note that such a mirror has coma and
astigmatism.
From the entries in Table 5.2 we also see that a sphere (K = 0) in a
configuration with m = —I, thus s' = s = R, has zero spherical aberration and
coma, hence is an aplanat.
As a final ...
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Publisher Resources

ISBN: 9780126298109