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Understanding Reflecting and Refracting Telescopes
Reflecting Telescopes are extraordinary instruments for exploring objects in the night sky and the key part of any telescope is the objective lens. The objective lens is what permits the light into the telescope enabling you to visualize the projected images from the sky. Telescopes with bigger objectives allow more light in and that means a fresher image for the viewer.
The two key designs of telescopes are reflecting telescopes and refracting telescopes. Both of these are quite similar in overall design except for the way in which they collect light.
Differences Between Refracting and Reflecting Telescopes
The objective in refracting telescopes is a piece of glass that is placed near the front end of the telescope. The objective guides the light that it collects and refracts, or bends, it to transmit it to the eyepiece, which in turn enhaces the image. Refracting telescope technology is utilisedin other occular equipment like binoculars, rifle scopes and spyglasses.
On the other hand, reflecting telescopes are unique because the objective is a mirror at the bottom end of the telescope rather than a glass lens at the front end. The mirror in a reflecting telescope has a concave shape, or a bowl-like shape, which permits it to capture the light in the center of the mirror and transmit it as one stream of light towards the eyepiece so the image can be seen.
Why Use a Reflecting Telescope
Reflecting telescopes are chosen by many astronomers for a range of reasons. A key reason is because there is less distortion with a reflecting telescope than with a refracting telescope since the mirror is able to gather and reflect all wavelengths of color consistently. The utilising of the mirrors instead of glass lenses makes reflecting telescopes more affordable than refracting telescopes.
When mirrors are utilized rather than glass lenses, the telescope can be designed much larger to allow for the supports for the mirror to be located on the posterior of the telescope. The larger the mirror that is used, the more light that is reflected and the better and clearer the image will be.
Disadvantages of the Reflecting Telescope
Reflecting telescopes can have their own issues and problems as well. One problem can be the size of reflecting telescopes. As designers use larger and larger mirrors, the telescopes have to grow in size to fit the mirrors inside. While you get better results with the larger reflecting telescopes, they are not what you would call easily portable and it can prove problematic finding a a convenient place to store them when you are not using them.
An additional consideration or problem is that reflecting telescopes may need to have the mirrors alignment corrected from time to time to keep them working perfectly and to maximize the light that is captured.
Many of the most popular telescope brands provide both refracting and reflecting style telescopes for the amateur astronomer.
Nearly all of the leading telescopes used in research are reflectors. Reflecting telescopes come in numerous design variations and may utilize complementary optic elements to improve the image quality or position the image in a mechanically advantageous position. As reflecting telescopes employ mirrors, the design is occassionaly referred to as a catatropic telescope.
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