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2. Cheshire eyepiece - Wikipedia

   en.wikipedia.org/wiki/Cheshire_eyepiece

   A Cheshire eyepiece or Cheshire collimator is a simple tool that helps aligning the optical axes of the mirrors or lenses of a telescope, a process called collimation. It consists of a peephole to be inserted into the focuser in place of the eyepiece. Through a lateral opening, ambient light falls on the brightly painted oblique back of the ...

3. Newtonian telescope - Wikipedia

   en.wikipedia.org/wiki/Newtonian_telescope

   Newtonian telescope design. A Newtonian telescope is composed of a primary mirror or objective, usually parabolic in shape, and a smaller flat secondary mirror.The primary mirror makes it possible to collect light from the pointed region of the sky, while the secondary mirror redirects the light out of the optical axis at a right angle so it can be viewed with an eyepiece.

4. Autocollimator - Wikipedia

   en.wikipedia.org/wiki/Autocollimator

   Visual autocollimators are often used for aligning laser rod ends and checking the face parallelism of optical windows and wedges. Electronic and digital autocollimators are used as angle measurement standards, for monitoring angular movement over long periods of time and for checking angular position repeatability in mechanical systems.

5. Collimated beam - Wikipedia

   en.wikipedia.org/wiki/Collimated_beam

   A perfectly collimated light beam, with no divergence, would not disperse with distance. However, diffraction prevents the creation of any such beam. [1] Light can be approximately collimated by a number of processes, for instance by means of a collimator. Perfectly collimated light is sometimes said to be focused at infinity.

6. Here are the best 'As Seen on TV' items under $25 at Walmart

   www.aol.com/lifestyle/best-seen-tv-items-under...

   Here are the best 'As Seen on TV' items under $25 at Walmart. Kristine Gill. September 22, 2022 at 6:47 AM. ... It comes with a built-in light so you can see what you're doing, and there are ...

7. Beam expander - Wikipedia

   en.wikipedia.org/wiki/Beam_expander

   A refracting telescope commonly used is the Galilean telescope which can function as a simple beam expander for collimated light. The main advantage of the Galilean design is that it never focuses a collimated beam to a point, so effects associated with high power density such as dielectric breakdown are more avoidable than with focusing ...