Читать книгу Optical Engineering Science - Stephen Rolt - Страница 17

All points lying on a particular conjugate plane are associated with a specific transverse magnification, M, which is equal to the ratio of the image and object heights. For an ideal system, there exist two conjugate planes where the magnification is unity. These are known as the principal planes. Thus, there are two principal planes and the points where the optical axis intersects the principal planes are known as principal points. The first principal point (plane) is located in object space and the second principal point (plane) is located in image space. The arrangement is illustrated schematically in Figure 1.7.

Figure 1.7 Principal points and principal planes.