55:. If an object is moved to the point occupied by its image, then the moved object's new image will appear at the point where the object originated. In other words, the object and its image are interchangeable. This comes from the principle of reversibility which states light rays will travel along the originating path if the light's direction is reversed. Depending on how an optical system is designed, there can be multiple planes that are conjugate to a specific plane (e.g. intermediate and final image planes for an object plane). The points that span conjugate planes are called conjugate points.
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The object and corresponding image points can be interchanged. The object plane and the corresponding image plane are conjugate to each other.
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of the lens or mirror. Interchanging the object and image positions does not change the result of the formula.
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is the distance from the object to the center of the lens or mirror,
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is at infinity and the conjugate image plane, at which the
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