Fiber optics was invented for the same reason that human optics were invented, the fiber was having trouble seeing clearly.
the very first one, around 400 years ago.
"Optical", in this case, simply means that they work with light.
multiple-mirror telescope OPTICAL ;p
It contains an objective lens and a lens in the eyepiece of the telescope.
HANS LIPPERSHEY INVENTED REFRACTING TELESCOPE.
lens
me
in the year 1941
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.
multiple-mirror telescope OPTICAL ;p
optical
Reflector.
See things that don't shine in the visible spectrum.
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
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.
Usually, by using your eye sight, optical telescope, or radio telescope.