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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
22 2. Preliminaries: Definitions and Paraxial Optics
These two-mirror designs have the added feature that the system focal length is
easily changed simply by putting in a different secondary mirror, without
changing the physical length by a large factor. As an example, consider a
Cassegrain telescope with parameters Fi =3, p = 0.25, and m = 3. Using
Eqs.
(2.5.1) we find
A:
= 0.3125 and the normalized secondary mirror-focal
surface separation is 0.9375. If we choose to increase the telescope focal length
by a factor of three, hence making m = 9, while keeping j5 = 0.25, then
A:
= 0.125 and mk =
1.125.
The modified telescope is only 1.2 time
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Publisher Resources

ISBN: 9780126298109