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For making a telescope two lenses of focal lengths 5 cm and 50 cm are to be used . Which lens will you use for objective ?
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Optical Glass Achromatic Objective Lens Concave&Convex Lens for DIY Telescope | eBay
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Homemade Paraboloid Diameter 114 300mm DIY Telescope Objective Lens Astronomical Newtonian Reflection Primary Mirror Parabola|Lenses| - AliExpress
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Optical system of a telescope
Float Glass Long Focal Length 260mm Double Convex Lens DIY Telescope Objective | eBay
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DIY Super MINI telescope How to make at HOME (Homemade refractor) - YouTube
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Refracting Telescopes - an overview | ScienceDirect Topics
History of Science Society -- Committee on Education
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telescope
astronomical optics, part 2: telescope & eyepiece combined
