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How telescopes work .

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Galileo made his first telescope in 1609, modeled after telescopes produced in other parts of Europe that could magnify objects three times. He created a telescope later that same year that could magnify objects twenty times.

In India 1618 first telescopes was used by astronomers.

While there is evidence that the principals of telescopes were known in the late 16th century, the first telescopes were created in the Netherlands in 1608. Spectacle makers Hans Lippershey & Zacharias Janssen and Jacob Metius independently created telescopes.

We all know that it was the discovery of the telescope that helped the astronomers to know more about the different heavenly objects. The telescope is a device that is used for getting a magnified image of very fair distant objects like the moon, the planets and the stars a telescope used for viewing such heavenly objects

is known as an telescope.

Like the compound microscope, the astronomical telescope is also made by using two convex lenses However, here, the lens facing towards the object-the objective lens is a convex lens of the large focal length and large aperture (diameter). The other lens, used as the eyepiece, is a convex lens of small tocal length and small aperture. These lenses are fixed at one end each of two cylindrical tubes: containing the eyepiece, fits in, and can slide within, the longer tube.
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