Galileo's Telescope
Galileo Galilei was a scientist who lived during the time of the renaissance. He is a notable figure in the world of astronomy because of the great improvements he made to the first telescopes. Many people believe that Galileo invented the telescope, but Galileo really just aided its progress. With the telescope, Galileo and his fellow astronomers were able to better observe the night sky and make deductions about the earth's place in the universe. Apart from that, the first telescopes were used for navigational purposes.
Using convex and concave lenses, Galileo was able to improve the first telescope by magnifying objects three times and later on thirty times better than its original model. This is how he was able to observe the night sky better. With the use of his telescope, Galileo was able to observe many facts about our solar system that are still correct today. The telescope Galileo improved works by refracting (bending) light. This light converges at a focal point; the eyepiece of the telescope helps the human eye gather more light than it could on its own and in effect it allows for focusing on a magnified and clear image.
Imagine shining a light through one side of a concave lens, and having this light focus on one point. The image that is projecting the light will appear on the focal point of the lens. You will be able to magnify this image by using a convex lens as your eyepiece. With the light shining from the object, you will be able to observe the object and objects surrounding it because of how the light bends through the lenses.
Since the time of Galileo, astronomers have been able to improve the telescope by creating a larger field of view because Galileo's field of view was rather narrow. They did this by rearranging the position of the lenses. Galileo's telescope will still work today, though, and if you have convex and concave lenses, you can easily make your own telescope.
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