Concave Mirrors
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-449
2025-12-17
371
may be formed of the concave surfaces of either spheres or paraboloids, hence the sections of concave mirrors by a plane will be arcs of either circles or parabolas. If C is the center of the sphere from which the mirror in Fig. 1 is formed, and MN the section of the mirror, then C is the center of curvature, A is the center of the mirror, CA is the principal axis, any other axis, as EB, is a secondary axis, and MCN is the aperture of the mirror. In the treatment which follows the aperture of the mirror is supposed to be not more than 10° or 12°, but in order B to construct the geometrical figures CA clearly it is taken much greater.
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