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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
12
2.
Preliminaries: Definitions and Paraxial Optics
Fig. 2.3. Angular magnification. See Eq. (2.2.8) for definition.
Equation (2.2.8) relates the transverse and angular magnification for a pair of
conjugate planes. Rewriting this relation we get
(2.2.9)
nh
tan
u = n'h' \2inu\
which in the paraxial approximation becomes
nhu = n'h'u'. (2.2.10)
If, as is customary, we let H = nhtanu, then Eq. (2.2.9) states that H before
refi-action is the same as H after refi-action. Thus in any optical system containing
any number of refracting (or reflecting) surfaces, H is an invariant. This follows
because the combination n'h'u' for the first surface is
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Publisher Resources

ISBN: 9780126298109