A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 375
arger than the object. What will be the directions after refraction of rays diverging from apoint beyond the principal focus of a concave lens ? Can diverging rays ever become either parallel or convergent by therefraction of such a lens ? Why ? What two rules apply for finding the focal distances… … DESCRIPTION OF THE EYE. 373 124. But if the object be placed at the focus of the lens, therays refracted being chiefly such as were parallel to its axis beforerefraction, the eye will not perceive a distinct image of the object.If we suppose the object E F to be placed beyond the focal dis-tance,…
Physics
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-400-277.webp)
