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The telescope is the wind of wandering, the spirit of adventure and the anticipation of discoveries
The prototype of the telescope was described as far back as the 13th century by a Franciscan monk and naturalist Roger Bacon. After that, the idea came to Italy. Passing through the hands of the great genius Leonardo da Vinci (the first detailed scheme plus the lens grinding machine) and the thoughtful Giambattista della Porta (a detailed description and the first sample), she reached Galileo Galileo and became the first true telescope. It happened in 1608.
Interest in an amazing optical instrument, fortunately, did not lose its power in the 21st century, when space telescopes are able to show Earthlings the most remote and ancient galaxies. Even playing a traveler and a pirate, one of the elements of which is certainly a telescope, awakens the spirit of the researcher in a teenager. And it's wonderful that special sets for children's creativity are sold, allowing to experiment with optics and at the same time to learn how optical instruments work and work.
Assemble two groups of lenses: long-focus (lenses) and short-focus (eyepieces). The first can be found in old telescopes, binoculars, glasses, the latter - in microscopes, cameras.
Now, do optical tests. Attach the future lens to the surface with plasticine so that the image from the light source, passing through it, remains on the sheet of paper put behind. Moving the eyepiece between the lens and a sheet of paper, achieve the most clear image on it. As soon as this happens, you will see how long your telescope is. In the same way, determine the focal length for each lens from the selected pair.
The homemade telescope is ready. But before you use it, read the warning. Strictly forbidden to look into it in the sun! A retinal burn can be fatal to your vision.
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