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The Importance Of Telescope

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Telescope is a tool that allows people to see objects from far away, beyond human vision, this helps a lot in researching for scientists, especially for astronomers to discover new stars, planets and galaxies. The first known telescope was introduced in 1608 by Hans Lippershey. Telescopes are an amazing tool, they come in a variety of shapes and sizes, with just a 15cm-long telescope, we can see a penny from 55m away or the world’s biggest refracting telescope at the University of Chicago’s Yeker Observatory has up to 1m lenses so we can unlock the secrets of the universe. There are 2 types of telescope, refracting telescope and reflecting telescope, but today, we are focusing on refracting telescope.
So, what is refracting? It is the change in direction of light rays when passing through the boundary between two transparent mediums with different refractive indices. When light rays travel in a given medium, they go in straight lines, but when it passes through the boundary between two mediums, it will bend. This happens only when it hits the boundary, once it passed it and “in” a medium, it continues travel in straight line. But, why does it bend, we all know that light can’t be bent in normal situation and light speed in vacuum is c~ 3.0*108 m/s. We also know that different mediums have different density, the more dense, the slower the light speed. Now imagine you and your friend are in the beach and you guys decide to swim all together, so you guys link arms, you are

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