Refracting Telescopes - Viewing The Universe
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Refracting Telescopes
As glassmaking became more refined and lenses were made of greater
quality, someone wondered what would happen if you placed two lenses in a row. The result of the experiment
eventually became the
refracting telescope...
The exact date of the building of the first refractor telescope is not known, but there is strong
documentary evidence for the presence of refracting
telescopes in England as early as the Sixteenth Century, though they did not
become widespread in Europe until the Seventeenth in the Netherlands. Hans Lipperhey (whose patent was rejected as being too easy to copy) an
d Zacharias
Janssen of the Netherlands, both claim the invention of the revolutionary device
that caused a whole new world view and spread all over Europe.
Whoever the inventor, the original telescope consisted of both a convex and
concave lens so the image could be viewed the right way up. In 1909, Galileo
refined the design by putting distance between the two lenses, refining the image
and reducing the rainbow effect of refracting light that had previously
surrounded distant objects. Galileo continued to refine the telescope improving
the magnification from a power of three to a power of thirty-three. In 1910 he
used the telescope to discover the moons of Jupiter, sunspots and the craters,
hills and valleys of the moon. His observations helped to challenge the view
that the Earth is the center of the universe.
Today telescopes that can match and improve on the observations of Galileo are
widely available. Created of a long tube of wood or metal with a lens at both
ends and an eyepiece, the tube keeps the lenses free from dust, debris and water.
The two lenses work in the same way as the original, focusing and refracting the
light that is then magnified by the eyepiece producing a clear image.
Modern telescopes are expensive and have a high resolution.
They are able to see
in great detail binary stars and planets as well as a large number of other
objects, though they are less useful for looking at very large distant objects
such as nebulae and galaxies.
About the Author: Scott Harker is the publisher of several websites including: Sherlock Holmes Pastiches, Harvest The Sun | Wind Power, Signs of Pregnancy, Meditation - The Inner Journey, and Health News.
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News About Refracting Telescopes
Telescopes For Astronomy - Help in Choosing the Right One Using Simple Mathem... 26 Aug 2010 at 3:47am
Boosh News (press release) (blog)
For example, a recommended aperture for a really useful first telescope would be at least 100mm for a refracting telescope, or 150mm for a reflecting ...
Detector of Space Rubbish Created - Russia-InfoCenter 3 Sep 2010 at 5:47am
Russia-InfoCenter
Russia-InfoCenter
Telescopes from Earth allow detecting objects larger than 10 cm. Russian physicists offer a solution ? a small refracting telescope with entrance pupil of ...
Chancellor Cohan, modern-day Galileo - PUC Chronicle 29 Aug 2010 at 8:18pm
PUC Chronicle
Slavin compared Cohen to a modern-day Galileo, the first person to use a refracting telescope which allowed mankind to look into the heavens in a new way. ...
Researching Telescopes For Sale - The Importance of the Eyepiece Lens - Boosh... 27 Aug 2010 at 4:03am
Boosh News (press release) (blog)
In the many telescopes for sale, this is where the eyepiece comes into play. The large objective lens (in refracting telescopes) or primary mirror (in ...
Watch Titan Occult a Binary Star System - Universe Today 27 Aug 2010 at 3:37pm
Universe Today
Back in 2001, a group of astronomers used the 200-inch Hale Telescope equipped with adaptive optics to observe Saturn's moon Titan pass in front of a binary ...