Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 63
onverge;for they will be bent towards the centre of the circle, theradius being the perpendicular to each point of curvature.The central or axial ray, as it coincides with the perpendicular,will undergo no refraction; the others will be bent from theiroriginal course ui an increasing degree, in… … Parallel rays, falling on a plano-convex lens, brought to a focus atthe distance of its diameter; and conversely, rays diverging fromthat point, rendered parallel. of curvature.—This effect wiU not be materially changed, byallowing the rays to pass into air again through a plane surfaceof glass,…
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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-233-142.webp)
