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关于白光色散和还原问题,本文指出了现行初中物理教材中的错误,然后给出了正确的解答。当一束白光通过一个三棱镜后,就会发生色散而变成七色光。如果让这七色光再通过另一个倒置的、同样的三棱镜,那么七色光能重新合成白光吗?对这个问题的普遍回答是肯定的。现行初中物理教科书中也是这样认为的(见初中物理第一册,人民教育出版社,1987年第2版,第3页)。现将书上的光路图重画于下面,如图1所示.实际上,这种认为是错误的.图1中,光在第二个棱镜中的路径是不正确的.正确的光路应如图2所
Regarding the problem of white light dispersion and reduction, this article points out the errors in the current junior middle school physics textbooks, and then gives the correct answers. When a white light passes through a triangular prism, dispersion occurs and becomes seven-color light. If this seven-color light is allowed to pass through another inverted, same prism, then can the seven-color light re-synthesize white light? The general answer to this question is yes. The current junior middle school physics textbook also thinks so (see the junior middle school physics book, People’s Education Press, 2nd ed., 1987, p. 3). The light path diagram on the book is now redrawn below, as shown in Figure 1. In fact, this view is wrong. In Figure 1, the path of light in the second prism is not correct. The correct light path should be As shown in Figure 2