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Additional
Cassegrain reflector
English Wikipedia - The Free Encyclopedia
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Cassegrain reflector
The
Cassegrain reflector
is a combination of a primary
concave mirror
and a secondary
convex mirror
, often used in
optical telescopes
and
radio antenna
s. This design puts the
focal point
at a convenient location behind the
primary mirror
and the convex secondary adds a
telephoto
effect creating a much longer
focal length
in a mechanically short system.
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