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几何光学中的物和像,包括实物与虚物,实像与虚像。然而,教学实践证明,物像虚实的判断,对于一次成像的情况并不难,但对于二次或二次以上的成像情况确实使不少学生为难。如互成直角的两平面镜之间放一物点A,物点A在两平面镜中得到三个像,如图1所示。对平面镜M_1,A_2是实物还是虚物呢?A_3是实像还是虚像呢?再如图2所示的物体AB通过光的虚实,首先要弄
Objects and images in geometric optics include physical and virtual objects, real images and virtual images. However, teaching practice has proved that the judgment of the actual image is not difficult for an imaging situation, but it is difficult for a lot of students to image two or more times. For example, if an object point A is placed between two plane mirrors that are at right angles to each other, the object point A gets three images in two plane mirrors, as shown in FIG. 1 . Is the plane mirror M_1, A_2 real or virtual? A_3 is a real image or a virtual image? Then the object AB shown in Figure 2 passes through the actual condition of the light.