Cassegrain Focus
Related Category: Astronomy: General
see telescope.
More on Cassegrain Focus
Telescope - traditionally, a system of lenses, mirrors, or both, used to gather light from a distant object and form an image of it.
Cassegrain focus: The optical design of a reflecting telescope in which the secondary mirror reflects light back down the tube through a hole in the center of the objective mirror.
Cassegrain Focus
An optical arrangement in which light rays striking the parabolic concave primary mirror of a reflecting telescope are reflected to the hyperbolic convex secondary mirror, ...
cassegrain focus - An optical arrangement in a reflecting telescope in which light is reflected by a second mirror to a point behind the objective mirror.
A solution is the Cassegrain focus arrangement. Cassegrain antennas add a secondary reflecting surface, called a subreflector, to "fold" the RF back to a focus near the primary reflector.
While the Newtonian focus design is still used in amateur astronomy, professionals now tend to use prime focus, Cassegrain focus, and coudé focus designs.
7 Four reflecting telescope designs: (a) prime focus, (b) Newtonian focus, (c) Cassegrain focus, and (d) coudé focus.
The second mirror in a reflecting telescope (after the primary mirror), usually either convex, to reflect the image out of a hole in the bottom of the telescope to the Cassegrain focus or along the telescope mount axis to the coudé focus; or flat, ...
Sequences of axisymmetric metrics external to black holes must be disjoint, i.e., have no members in common. [H76]
Cassegrain Focus ...
Instead we place a smaller curved mirror, called the secondary, just inside the telescope focus where it reflects the light down the telescope tube and through a hole in the primary mirror to a focus just behind it, called the Cassegrain focus.
 See also: Focus, Telescope, Astronomy, Light, Second
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