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Related to Conjugate Points: conjugate planes
conjugate points[′kän·jə·gət ′pȯins]
in optics, a pair of points in an optical system such that if one point represents the object, the other point represents its image. In accordance with the principle of reversibility, the object and image can be interchanged. Strictly speaking, the concept of conjugate points is applicable only in the paraxial regions of ideal (nonaberrational) optical systems (seePARAXIAL RAYS). The concept, however, is often used as an approximation in real systems.