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What are the characteristics of two kinds of imaging when measuring the focal length of convex lens by Belser method?
When measuring the focal length of convex lens by Bessel method (also called secondary imaging method), there is a * * * yoke relationship between the two imaging methods. In optical imaging, there are two points Q and Q' with one-to-one mapping relationship between an object and an image. According to the principle of optical path reversibility, if a light source is placed at Q point, it will be imaged at Q' point, and vice versa. Such two corresponding points are called a pair of yoke points. * * * The yoke point can form a * * yoke line, and then there is a * * * yoke surface.