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lenses
... more efficient by the likes of Galileo. Telescopes use light and lenses to focus the light on objects in great detail. What happens to the light is it converges and you see an image that is much bigger ...
... works is quite simple.  A scope has a double lens; such lenses are where you look through to clearly see distant objects. The first of the lenses receives the light coming from the object and then throws ...
... an eyepiece provides depends on the focal length of your telescope - divide the telescope focal length by the eyepiece size to get the magnification. A typical refractor (uses lenses rather than a mirror) ...
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