0
Why have no large refracting telescopes been built since 1900?
Wiki User
∙ 12y ago
Refracting telescopes suffer from chromatic aberration, refracting telescopes have several surfaces to shape and polish, making large glass lenses without interior defects is very difficult, and large glass lenses are more difficult to support than large mirrors.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Can Refracting telescopes can be much larger than reflecting telescopes?
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.
Is the Worlds largest telescope refracting or reflecting?
Large lenses deform under their own weight, but mirrors can be supported. Reflectors do not suffer from chromatic aberration like refractors do. Large mirrors need only one optical surface, achromats four surfaces to grind. Large, very clear lenses are harder to cast than more tolerant mirror blanks.
What advantages do reflecting telescopes have over refracting telescopes?
refracting telescopes use lenses instead of mirrors. 1. chromatic aberration: when light passes through a lens it is focused at different points. Blue focuses closer to lens and red farther creating a smeared image. 2. Some light is absorbed by lenses. 3. Lenses are heavy and can only be supported by the edge. 4. Lenses must have to optically acceptable surfaces whereas a mirror only needs one.
How many refracting telescopes are there in the world?
to answer your question there are four categories of telescopes (1) optical telescopes: it uses concave mirrors in reflecting telescopes and they were created to collect light and be used to view distant objects by using the light to form the image. (2) radio telescopes: they are used to detect energy in the visible spectrum(light)and they also detect energy that has been emitted in wavelengths across the electromagnetic spectrum and can prove that some of the energy emits more non-visible radiation (radio waves) than the others, they are mostly used at night but for some certain areas they are used to understand different reactions during the day. (3) infrared telescopes: they are used to collect and photograph Infrared radiation to provide a complex type of map (heat map) to help study an object or area under investigation. (4) telescopes in space: collecting information using telescopes on earth, wether they are optical, radio or infrared are all subject to a degree of interference by the atmosphere which is why astronomers commonly use telescopes out side the earths atmosphere because of the minimal interference. An example of one is the Hubble space telescope launched in 1990 by NASA and two months later it was discovered that the telescopes mirror had been ground to flat and would not focus sharply. In 1994, after 30 hours of space walks by 5 astronauts, ten button-sized mirrors were installed to remedy the fault. A resolution 10 times better than that of any telescope on Earth was achieved. hope this thoroughly answered your question and the extra info is just for a further understanding of telescopes thanks for referring to my answer made by D.F
How have people observed Halley's comet since 1682?
how have they observed halleys comet since 1682vfggbnhfgnf
Are reflecting telescopes are more popular than refracting telescopes?
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.
Can Refracting telescopes can be much larger than reflecting telescopes?
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.
Is the Worlds largest telescope refracting or reflecting?
Large lenses deform under their own weight, but mirrors can be supported. Reflectors do not suffer from chromatic aberration like refractors do. Large mirrors need only one optical surface, achromats four surfaces to grind. Large, very clear lenses are harder to cast than more tolerant mirror blanks.
What advantages do reflecting telescopes have over refracting telescopes?
refracting telescopes use lenses instead of mirrors. 1. chromatic aberration: when light passes through a lens it is focused at different points. Blue focuses closer to lens and red farther creating a smeared image. 2. Some light is absorbed by lenses. 3. Lenses are heavy and can only be supported by the edge. 4. Lenses must have to optically acceptable surfaces whereas a mirror only needs one.
What is the orgin for the word telescope?
Telescopes have been around since 1608, and they have been called "telescopes" the entire time. There is no original word.
How many refracting telescopes are there in the world?
to answer your question there are four categories of telescopes (1) optical telescopes: it uses concave mirrors in reflecting telescopes and they were created to collect light and be used to view distant objects by using the light to form the image. (2) radio telescopes: they are used to detect energy in the visible spectrum(light)and they also detect energy that has been emitted in wavelengths across the electromagnetic spectrum and can prove that some of the energy emits more non-visible radiation (radio waves) than the others, they are mostly used at night but for some certain areas they are used to understand different reactions during the day. (3) infrared telescopes: they are used to collect and photograph Infrared radiation to provide a complex type of map (heat map) to help study an object or area under investigation. (4) telescopes in space: collecting information using telescopes on earth, wether they are optical, radio or infrared are all subject to a degree of interference by the atmosphere which is why astronomers commonly use telescopes out side the earths atmosphere because of the minimal interference. An example of one is the Hubble space telescope launched in 1990 by NASA and two months later it was discovered that the telescopes mirror had been ground to flat and would not focus sharply. In 1994, after 30 hours of space walks by 5 astronauts, ten button-sized mirrors were installed to remedy the fault. A resolution 10 times better than that of any telescope on Earth was achieved. hope this thoroughly answered your question and the extra info is just for a further understanding of telescopes thanks for referring to my answer made by D.F
How have people observed Halley's comet since 1682?
how have they observed halleys comet since 1682vfggbnhfgnf
How have telescopes changed since they were invented?
They have changed because now there is a telescope in space called the "Hubble". I can see things that regular telescopes on Earth cannot see.
How long has the telescope been around?
Telescopes have been around since before the 1500's.
Can you put r134a in a 93 Dodge Intrepid?
Yes, since it was built with that when new.Yes, since it was built with that when new.
How many years has it been since the Lincoln Memorial was built?
Its been built since 1922 so its been built for 88 years
What is replacting telescope?
answ2. Telescopes come in two flavours, reflecting and refracting.Reflecting telescopes rely on the light first meeting a mirrored reflector which may be of large area, then passes through various focusing lenses.Refracting telescopes have the light passing through a lens, before meeting the focusing lenses etc.Now, there is a loss of light each time the light passes into or out of a glass, even ignoring imperfections of the surface. And more when that is considered.And it is more than doubly difficult to make a large lens than a large mirror.And since astronomy is mainly limited by the light-gathering power, this is vital to astronomers.A1. Nothing. Any device to see the light of distant stars or other objects would still be called a telescope.
