Large telescopes are primarily reflectors, not refractors. Reflectors use mirrors to gather and direct light from the object being observed, while a refractor uses lenses to do the same thing. The reflective surfaces of a telescope can be larger than those of a lens because they have no need for supporting structures or large connecting tubes like lenses require. These two differences allow reflector telescopes to totally dominate the market for large observatories on earth and in space.
However, the disadvantage of a reflector telescope is that it has to be pointed at what you’re looking for. If you want to observe an object in two different locations (say Jupiter and Saturn), then you would have to point your telescope twice in those directions. But if we had both a refractor and a reflecting telescope side-by-side, and we wanted to take photos or video of Jupiter with one while observing Saturn with the other, they could each be pointed independently towards their respective objects because they use lenses rather than mirrors.
This means that large observatories on earth are primarily made up of reflectors because they do not need to move as much as refractors when taking measurements. However, smaller telescopes like those you might have in your backyard are usually refractors because they can be pointed at any object without needing to move.
Now, some people believe that the problem with reflectors is that they only take back what’s there and don’t add anything new or interesting – but this isn’t really true. One way to think of it is like a movie projector: The light reflects off the surface of an object (in this case, off a mirror) and then shines into our eyes so we can see it on screen. It’s not adding anything extra to the image; rather, it’s just showing us exactly what was already there! This is why telescopes need mirrors angled slightly away from each other in order for them to reflect an image back towards us.
On the other hand, with a refractor telescope, light is bent as it passes through different lenses so we can see objects that are often too distant for any other type of instrument. And while this might be great if you’re studying something like clouds in our atmosphere or stars millions of miles away from each other, what about those close-up views? This is where mirrors have one final advantage: The easiest way to make a mirror larger than your average home model — and therefore increase its ability to gather more light — is by using extra panels around it (much like how you would build up layers on top of scaffolding). With these multiple curved sections arranged just right, they can produce a bigger, brighter reflection.
why are most large telescopes reflectors not refractors?
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Refracting telescopes use lenses to focus incoming light
Reflecting telescopes uses mirrors to reflect and spread out light
The main advantage of a reflecting telescope is that it doesn’t introduce any extra optical distortions like a lens does (no chromatic aberration, no coma) – this makes them good for observing faint objects.
The disadvantage of reflective systems is that they are usually much larger than refractive ones. This means they have less resolving power because there are more diffraction effects due to the long exposure times needed when magnifying distant objects. They also require very stable environments so as not to be affected by air turbulence which can degrade their images significantly over time. Lastly, because