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现行初中物理教材(见初中物理第一册,人民教育出版社,1987年第2版,第3页)中,关于白光通过三棱镜色散的光路图如图1所示。实际上,色光在右边棱镜中的路径是不正确的。正确的光路应如图2所示。在图2中,因A′C′面平行于AC面,由折射定律可知,色光在右边棱镜中的路径与其在左边棱镜中的路径是一一对应、互相平行的。于是,色光在右棱镜中将进一步发散;又A′B′面平行于AB面,同样由折射定律可知,从右棱镜出射的色光分别与左棱镜AB面上
The current junior high school physics textbooks (see junior high school physics booklet, People’s Education Press, 2nd edition, 1987, p. 3) show the optical path diagram of white light passing through the prism dispersion as shown in Fig. 1. In fact, the path of colored light in the right prism is not correct. The correct light path should look like Figure 2. In FIG. 2 , since the A′C′ plane is parallel to the AC plane, it can be known from the law of refraction that the path of the colored light in the right prism and the path in the left prism are in one-to-one correspondence and parallel to each other. Thus, the colored light will further diverge in the right prism; the A′B′ plane is parallel to the AB plane, and also by the law of refraction, the color light emitted from the right prism is respectively associated with the left prism AB surface.