Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 110
eis located. The point / is the principal focus, and isthe point at which all rays parallel to the principalaxis are focused. The principal focus is located at onehalf the distance from c to 0. The focal length is the dis-tance (Of) from the center of the mirror to the principalfocus. 120. Image in… … Figure 77. — Construction of Image in a Concave Mirror. principal axis, it must be reflected through the principalfocus /. This determines line dx. Second, draw ag from a through the center of curvature c.This ray is reflected back upon itself, since it strikes themirror perpendicularly. The point…
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-397-275.webp)
