There are many different sorts of telescopes in the world and are all used for different things. Reflecting telescopes are used for observing objects in space. Did you know the Hubble Space Telescope is a reflecting telescope?
Many reflecting telescopes take after the Cassegrain Telescope, and are based off it. An ordinary Newtonian telescope has a basic primary mirror, a secondary mirror, tubes, eyepieces, and focal planes. Light bounces off the primary mirror, onto the secondary, and sends it to focal planes with eventually lead to the tube and eyepieces, where you see the image. A telescope is a cool invention, and without it, we wouldn't even know planets and stars existed!
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