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 278
cave andconvex mirrors: The middle point of the mirror is called its vertex. Thecentre of the sphere, of which the mirror forms a part, iscalled the optical centre. The indefinite straight linethrough the optical centre and the vertex, is called theprincipal axis, or sometimes simply the axis. Any… … Fig. 162. It is to be observed, tbat in practice the surface of a curved mirroris only a very small part of the surface of the sphere of which itforms a part. Concave? Convex? (2I7I7) What is a Concave Mirror? What is the vertex?The optical centre ? The principal axis? A principal section?…
Physics
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