Syntagma h Cafut VIL 71 … Demonftratio. Radius D E vi primx Demoa-refradionis per coroU, pro: 4. hujus tcn-^^^^^^o-dit direde ad pund:um F diftantiam fcilicccfefquidiametri convexitatis: fed Sc pundlumF eft centrum concavitatis ex fuppofitione,erit ergo F L E perpendicularis ad fuperfi-ciem concavam A FI LB: &…
Optics, Geometrical · Optical instruments
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