All distances are measured from the
(focus/ pole/ centre of curvature) of a spherical mirror.
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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.
distance between pole and centre of curvature is called radius of curvature {r=2f, where f is focal length}.
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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