what is relationship between pole and center of curvature
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The distance from the pole to the center of curvature is called (no surprise, I hope) the radius of curvature (r). The distance from the pole to the focal point is called the focal length (f). The focal length of a spherical mirror is then approximately half its radius of curvature.
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Pole is mid of aperture
Centre of curvature is half of aperture which is part of aperture
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