b) The radius of curvature of a mirror is
of the focal length.
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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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Explanation:
If the radius of curvature is 150 cm. then the focal length is 75 cm. The light will converge at the focal point, which is a distance of 75 cm from the mirror surface.
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The Anatomy of a Curved Mirror.
Principal axis Center of Curvature Vertex
Focal Point Radius of Curvature Focal Length
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