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 520
perpendicular to the corresponding element, or, what is the same thing,to its corresponding tangent plane. It is shown in geometry that in spheresall the normals pass through the centre of curvature, so that the normal mayreadily be drawn to any point of a spherical mirror. 525. Focus of a… … -525] Focus of a Spherical Concave Mirror. 503 Real focus.—We shall first consider the case in which the rays of lightare parallel to the principal axis, which presupposes that the luminous bodyis at an infinite distance. Let GD (fig. 462) be such a ray. From the hypothesis that curved mirrors are…
Physics
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