Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 402
to the incident and emergent rays which gives mini-mum deviation, and consequently the nearest approach of the rayPQ to the focus S^. One form of thick lens of great angular aperture commonly used as partof microscopic objectives is almost entirely free from spherical aberration.Suppose that a… … Therefore, cs.=R[r sin a The angle at C is common to thetwo triangles CSO and CSiO, hencer + a^= i + ^, and if /3 =z r, a ^ «.In this case, if n be the index ofrefraction of the sphere, CSi = R/n ; CS = nR Tiis~4s-aa- exact relation, no matterhow large the angle i may be, sothat an object in the…
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-335-226.webp)
