Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 327
317 Piano Convex Lens. /= + m—1 The optical centre is in the convexsurface. … /- + ■ Convex-concave Lens (Meniscus.)Br(m—l)(R—r) Draw the radii R and r parallel toone another.—Draw n o, then o is theoptical centre.
Mechanical engineering · Engineering
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-318-34.webp)