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Newtonian
Reflecting Telescope
The
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The Newtonian
Reflecting Telescope. The
Newtonian reflecting telescope is probably the most common visual
telescope type in use today. Invented by Sir Isaac Newton about
400 years ago, the Newtonian telescope works by collecting light
on a large "primary mirror" which is then reflected it
back to a smaller mirror that finally bounces the image back into
an eyepiece where the user focuses the image. A reflecting telescope
offers several advantages over another commonly used visual telescope,
the refractor (which uses lenses instead of mirrors to collect and
focus light). These advantages include an absence of chromatic aberration
(incorrect color shift in refractors), they are relatively inexpensive
to make, and they can be made much more compact than a refractor
of the same aperture.
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