It is used to observe features of stars, planets, and other celestial objects by their visible light (generated or reflected).
"Optical", in this case, simply means that they work with light.
The lenses used in reflector telescope is the concave lens.
A reflector telescope collects light with a mirror. The mirror is located at the back of the telescope and reflects the incoming light to a focal point where it is then collected by an eyepiece for viewing.
A small aperture.
In space, there is no interference by Earth's atmosphere.
The Hubble Space Telescope has a number of instruments, but the primary one is an optical telescope.
"Optical", in this case, simply means that they work with light.
optical
Reflector.
See things that don't shine in the visible spectrum.
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The surface of a radio telescope doesn't have to be as flawless as the surface of an optical telescope because the radio telescope is collecting radio waves, something that will not be affected by faults in the glass. Optical telescopes, on the other hand, are collecting light, where faults in the surface can interfere with the image.
Radio telescopes collect radio waves. Optical telescopes capture visible light waves.
you can get the optical components to repair an old telescope at http://www.astromart.com/classifieds/details.asp?classified_id=644695. Another site is www.Fixya.com/Telescope+Repair
Usually, by using your eye sight, optical telescope, or radio telescope.
the optical telescope has discovered objects on earth and in space
Example of an optical instrument? (not sample) Microscope.