in this type of refracting telescop, both concave and convex mirrors are used
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Galileo made telescopes with a convex objective and a concave eyepiece. These produce an upright image and are used in spyglasses. Most simple refracting telescopes have two convex lenses. The objective forms a real, inverted image at (or just within) the focal plane of the eyepiece.
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Refracting telescopes work by using two lenses to focus the light and make it look like the object is closer to you than it really is. Both lenses are in a shape that's called 'convex'. ... Reflecting telescopes, on the other hand, don't use lenses at all. Instead, they use mirrors to focus the light together.
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