Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 279
I and Ci are normals at the points of incidence, Zand i.IF and %F are reflected rays, making the angles of reflec-tion equal to the angles of incidence. When the mirror issmall, compared with the whole sphere, all other rays parallelto the axis are reflected to the same point, F. Hence, fromthe… … (278.) What is a F<x3us ? The Principal Focus? Illustrate MIRRORS. 277 Fig. 163 shows the manner 01 determining the principal focus byexperiment, making use of a beam of light coming from the sun.In this form the concave reflector may be used to collect the rays forth« purpose of developing a…
Physics
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