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Galileo used was a crude refracting telescope.magnification he used for his observations for Sidereus nuncius.. when made up of several elements, both converging and diverging — must always be converging as a whole. The Galilean and the Keplerian telescopes thus differ only in the eyepiece.The Galilean telescope, although it furnishes erect images with the aid of erector devices.
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It had a convex objective lens and a concave eyepiece in a long tube.
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