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Why should the objective of a telescope have large focal length and large aperture? Justify your answer.
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F70076 Large Aperture 350 Times Hd Zooming Reflective Professional Astronomical Telescope For Space Heavenly Body Observation - Telescope - AliExpress
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Reflector Telescope,76mm Aperture 700mm Focal Length Astronomy Reflector Telescopes (35X-875X) for Adults and Kids-with 3 Eyepieces,5X Barlow Lens,Solar Filter,Moon Filter and Smartphone Adapter - Walmart.com
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Conceptual art of Surrey's large aperture size space optical telescope... | Download Scientific Diagram
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