ericitatis , non quales eas fiint, quse obiter inoilicinis vitrariisefBanturintusvacux, aqua deindehmpida aut quovis ahopuriorehquoreimpletse, pauloaham ob medii diverfitatem in refringendisradiisnaturam habent: radii quoque in eas mcidentes fiipponuntur non ni-mium ab axe diflantes,ad… … 1& Slt fphsera AB adquamincidatpun-dlo Eradius DE axi HA^ parahc-ius. Dico, quod fada duplici re-fradtione pofl fph^eram concurrat cumaxe in pun6to G ad diflantiam B quasiequahs eft quart^ parti diametri AB.Sitcnim A^ fesquidiamcter &: B G di-midfaipfiusBiT. Demonflratio. Radius D E vi…
Optics, Geometrical · Optical instruments
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