Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 524
an conceive a secondary axis drawn through each of its points, andthus a series of real or virtual foci could be detennined the collection ofwhich composes the image of the object. By the aid of the construc-tions which have served for determining the foci, we shall investigatethe position and… … the image or the focus of any point A, a secondary axis, AE, is drawn fromthis point, and then drawing from the point A an incident ray AD, thenormal to this point, CD, is taken, and the angle of reflection CDa is madeequal to the angle of incidence ADC. The point a, where the reflected raycuts the…
Physics
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