hence the image position depends on the ray height at the first surface. We
consider the aberrations of a thick plate in more detail later.
2.5.
TWO-MIRROR TELESCOPES
We now apply the results of the preceding sections to the general class of
two-
mirror systems. In this section we are concerned only with the paraxial properties
(a)
(b)
Fig. 2.7. Schematic diagrams of two-mirror reflecting telescopes: (a) Cassegrain; (b) Gregorian.
Designated parameters
are
JFI
and725 height of ray at margin of primary and secondary, respectively; D,
telescope diameter =
2|JFI
I;
2\y2\, diameter of secondary mirror; R^ and
R2,
verte ...
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