Telescopes. How do they work?. 1. History. 2. Lenses & Hardware. 3. Reflecting Telescopes. 4. Refracting Telescopes. History. Hans Lippershey Middleburg, Holland invented the refractor telescope in 1608 Galileo
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How do they work?
2. Lenses & Hardware
3. Reflecting Telescopes
4. Refracting Telescopes
The answer is simple: the object does not take up much space on your eye’s screen (retina).
Using a digital camera analogy, at 150 feet the writing on a dime does not cover enough pixels on your retinal sensor for you to read the writing.
This can be corrected by bending the light with lenses.
When you combine the objective lens or primary mirror with the eyepiece, you have a telescope.
Again, the basic idea is to collect lots of light to form a bright image inside the telescope, and then use something like a magnifying glass to magnify (enlarge) that bright image so that it takes up a lot of space on your retina.
The purposes of the eyepiece are to:
Filters are pieces of glass or plastic that you can place in the barrel of an eyepiece to restrict the wavelengths of light that come through in the image.
Set of filters for viewing, including a light pollution filter (left) and colored filters for enhancing contrast in planetary images.
Filters can be used to:
Both types accomplish exactly the same thing, but in completely different ways.
This is the simplest telescope design you could have. A big lens gathers the light and directs it to a focal point and a small lens brings the image to your eye.
Refracting telescopes are
not used for astronomical
because they are large
and have heavy lenses