What are the disadvantages of telescopes?
The disadvantages are mainly to do with the hassle of operating in space. It’s much more expensive, so you can’t have such a large telescope. If things go wrong it’s much harder to repair them. You can’t update the instruments so often so they quickly become out of date.
What are the 3 difficulties in using refracting telescope?
Disadvantages:
- Very high initial cost relative to reflector.
- A certain amount of secondary spectrum (chromatic aberration) unavoidable (reflector completely free of this) The colours cannot focus at one point.
- Long focal ratios can mean that the instrument is cumbersome.
How does the optical telescope work?
Optical telescopes allow us to see further; they are able to collect and focus more light from distant objects than our eyes can alone. This is achieved by refracting or reflecting the light using lenses or mirrors. This second lens is then responsible for focusing that light to produce a clear image of the object.
What do optical telescopes detect?
Optical telescopes collect visible light. The three main types are reflecting telescopes, refracting telescopes, and catadioptric telescopes. Radio telescopes collect and focus radio waves from distant objects. Space telescopes orbit Earth, collecting wavelengths of light that are normally blocked by the atmosphere.
Why do Astronomers need a big optical telescope?
VERY important: a larger aperture collects more light. The real reason astronomers want big telescopes is to detect fainter and fainter objects. The faintest object visible in a telescope depends on the amount of light the telescope can gather which in turn depends on its collecting area:
How did the reflecting telescope reduce the length of the telescope?
By using a curved mirror to reflect and focus the light inside the tube, he was able to reduce the length of the telescope dramatically. The reflecting telescope solved another problem inherent in the refracting telescope: chromatic aberration. described how white light is actually a mixture of colored light.
When was the invention of the optical telescope?
Optical telescopes have undergone several changes since their invention in the late sixteenth century. All telescopes gather light from a large area and bring it to a common focus. But the way they focus the light varies with design.
How are telescopes changing our view of the universe?
Some new telescopes allow us to study objects in the universe by detecting the heat or radio waves or X-rays they emit. Telescopes are now discovering planets around other stars. Future telescopes will be useful to answer a fundamental human question: “Are we alone in the universe?”
https://www.youtube.com/watch?v=t_nw0Yjxxbc