. QmaEIM & NIF peri^.primiEuclid.fiimt2equales,finempeaccuratiorIinca FI cogitetur tranfne per pundumljdein-dcetiamperprxced.angulus refradionisavitro in aeremfitmedia pars incli-nationis invitro,facile demonff:raripotcrit,anguIumIGF futurum dimidiumanguli NIF, a^angulos GIF&FGI fere… … •^mmmmm Syntagma I^ (^aput IV»CoroUaria, 29 l l Lcns plano-convexa Solis radiis opponatur, & ad diHantiam diametri Lens ufto-^fomencum aliquod apponatur, facile ignis excitabitur : nam radii So- ^-lis cum a longinquo veniant, & ideo ccnfeantur paralleli } in Jfuperfi--ciemlentis incidcntcs…
Optics, Geometrical · Optical instruments
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