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Super albo pariete pingere visibilia lente convexa.
In camera obscura lens convexa obsideat unicam fene∣stellam. Papyrus ad punctum concursus applicetur. Nam punctum rei visibilis super papyro, omnibus radiis, quibus in lentem radiat, rursum in unicum fere punctum colligi∣tur. Constant vero visibilia punctis infinitis. Infinita igitur talia puncta pingentur super papyro, id est tota rei visibilis superficies.