In principle, there's no reason why it couldn't be. But it would be prohibitively
expensive, harder to operate mechanically, and tough to match the optical
performance of an equal-sized reflector. That's why, bowing to pragmatism
and practicality, there hasn't been a larger refractor built since the 40-incher
at the Yerkes Observatory was completed in 1895.
Most modern telescopes are reflecting telescopes because reflecting telescopes are generally more cost-effective and easier to build at larger sizes compared to refracting telescopes. Reflecting telescopes also suffer less from chromatic aberration and can have a simpler design with fewer optical elements.
reflecting and refracting telescopes
Reflecting telescopes are typically more cost-effective to build for larger apertures compared to refracting telescopes due to simpler construction and fewer optical components. Reflecting telescopes do not suffer from chromatic aberration like refracting telescopes, leading to sharper images with better color accuracy. Reflecting telescopes can also be made with larger apertures, allowing for better light-gathering capability and higher resolution for astronomical observations.
They are refracting telescopes(:Large refracting telescopes are no longer built because there were too many problems with them. There was color distortion, light pollution, and when the object hits the focal point it turns upside down. Then you don't see the object for what it really is, you see it upside down and weird-ed out. They are to complicated and scientists believed they should just stick with the simple, small, original refracting telescopes!!!!-Meghan Betts (8th grader)
The objective lens of the REFRACTING telescope has to be a single gigantic piece of perfect glass.The light being observed goes all the way through it, so any imperfection anywhere ... on either surface oranywhere INSIDE it ... can affect the quality of the image. It also has to be totally stable and rigid, sinceit can only be supported around the edge.The mirror of the REFLECTING telescope only has to have a perfect SURFACE. The light hits the surface andbounces off of it, so nobody cares what happens behind the surface. The mirror can be made of two-by-foursor old crushed beer cans, and it can be supported by a solid rigging of carpenter's scaffold. Just as long asit has a perfect front surface, we don't care.For any large size you want for the objective element ... large enough to be attractive as a muscularastronomical instrument ... it turns out to be much easier and cheaper to build a parabolic mirror of thatsize than to build a perfect lens of the same size.
Most modern telescopes are reflecting telescopes because reflecting telescopes are generally more cost-effective and easier to build at larger sizes compared to refracting telescopes. Reflecting telescopes also suffer less from chromatic aberration and can have a simpler design with fewer optical elements.
A reflecting telescope uses mirrors while refracting telescopes uses lens. The refracting telescope also had chromatic aberration and bad resolution while the reflecting telescope had none of these.
reflecting and refracting telescopes
Size... a reflecting telescope with the same power as a refracting telescope is much shorter. This is because, in the reflecting telescope, the incoming light is bounced off mirrors (often more than once) which means the physical length is much shorter than an equivalent refracting model.
Reflecting telescopes are typically more cost-effective to build for larger apertures compared to refracting telescopes due to simpler construction and fewer optical components. Reflecting telescopes do not suffer from chromatic aberration like refracting telescopes, leading to sharper images with better color accuracy. Reflecting telescopes can also be made with larger apertures, allowing for better light-gathering capability and higher resolution for astronomical observations.
They are much shorter than refracting telescopes, hence, much cheaper to buy and easier to transport.
They are refracting telescopes(:Large refracting telescopes are no longer built because there were too many problems with them. There was color distortion, light pollution, and when the object hits the focal point it turns upside down. Then you don't see the object for what it really is, you see it upside down and weird-ed out. They are to complicated and scientists believed they should just stick with the simple, small, original refracting telescopes!!!!-Meghan Betts (8th grader)
The three major types are the optical, the infrared, and the radio telescopes. There are other specialized instruments for observing gamma rays, or x-rays, or for doing processes such as interferometry. Among the optical telescopes are the refracting (lens), reflecting (mirror) and compound telescopes (computer-assisted combinations of several smaller telescopes to simulate a much larger one).
The two types are refractor and reflector. In a refracting telescope, the light comes in THROUGH a magnifying LENS where it is REFRACTED (bent) to focus the light into an objective lens. In a reflecting telescope, the light BOUNCES OFF a curved magnifying MIRROR , and then reflected again on a secondary mirror to direct the light into an objective lens. Among the advantages of a reflecting telescope are that in a refracting lens, the thickness of the lens can absorb some of the light, while a mirror reflects all of the light. Additionally, a reflecting telescope can "fold" the telescope into a much more compact instrument, which is essential with especially large devices. A large refracting telescope would be enormously heavy and cumbersome.
Not exactly. A light telescope is a telescope that catches and shows visible light. The main light-gathering piece may either be a lens, in which case you would have a refracting telescope. Or - much more common with the larger telescopes - the main light-gathering piece is a parabolic mirror. In this case, it is a reflecting telescope. The largest refracting telescope is about 1.2 meters in diameter; all larger telescopes - currently up to about 8 meters - are parabolic mirrors.
In principle, there's no reason why it couldn't be. But it would be prohibitively expensive, harder to operate mechanically, and tough to match the optical performance of an equal-sized reflector. That's why, bowing to pragmatism and practicality, there hasn't been a larger refractor built since the 40-incher at the Yerkes Observatory was completed in 1895.
Reflecting telescopes give a brighter, clearer image that refraactors in many cases. Add to that the fact that refractors become very impractical with objective lens sizes much above 40 inches, while reflectors can have mirrors of 200 inches and more.