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National Repository of Grey Literature

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The Virtual Imaging of the Distant Objects by Longfocal Positive Lenses and Concave Mirrors Rail, Zdeněk ; Vápenka, David The longfocal positive lenses and concave mirrors can serve as optical elements increasing the angular dimensions of the distant objects similarly to telescope.\nThese properties could be probably used by ancient observers before the discovery of telescope.\nOur paper brings optical analysis and results of visual astronomical observations with the longfocal positive lens. Detailed record

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