Principal focal length and centre of curvature
File:Object placed between focal point and centre of curvature - convex lens.png - Wikimedia Commons
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File:A diagram representing a convex mirror, which shows its focal point, focal length, center of curvature, and the principal axis.png - Wikimedia Commons
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The value of the focal length of the lens is equal to the value of the image distance when rays are (A) Passing through optical center(B) Parallel to the principal axis.(C) Passing
