《物理教师》1992年第9期发表了王祥信同志的论文,对用两个棱镜能否使白光色散后再还原的问题进行了讨论,文章得出的结论是:用两个顶角相同相互倒置且侧面平行的棱镜不能使白光色散后再还原。笔者通过仔细研究和实验验证,并查阅了很多资料,认为该文得出的上述结论是不正确的。原因是王祥信同志的论文出现了两方面的前提性失误,导致了讨论结果的错误。 In the 9th issue of Physics Teacher, published in the 9th issue of Comrade Wang Xiangxin’s thesis, the question of whether or not two prisms can disperse the white light and then restore it was discussed. The conclusion reached in the article is that the two vertices are inverted in the same way. The side-parallel prisms cannot disperse the white light and then restore it. The author through careful study and experimental verification, and access to a lot of information that the above conclusions drawn from this article is not correct. The reason is that Comrade Wang Xiangxin’s thesis has presented two aspects of the premise error, which led to the mistake of the discussion.