Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 203
se rays from a source of light placed at one meet atthe other. So again if the light be placed at the principal focus F,the reflected rays are parallel. 079. Formation of Images. The image of an objectplaced in front of a concave mirror can be found by con-sidering each point of the object as a… … extremities A andB. For if these bedetermined, all in-termediate pointswill be on the linejoining them. Thesecondary axes areFig. 217. AFandBG. Then draw rays from the points A and B to the mirror, as Ar and Bs. Theradii to the points of meeting, Cr and Cs, give the angles of inci-dence, and the…
Physics
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