If \(x\) and \(y\) be the distances of the object and images formed by a concave mirror from its focus and \(f\) be the focal length then:
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Newton's Formula \(xy = f^2\) is valid for both concave and convex mirrors, provided that the distances \(x\) (object distance) and \(y\) (image distance) are strictly measured from the principal focus, not the pole.