关于复色光偏离比耳定律的证明,已有四种不同方法。这些方法在论证时使用的复色光只有两个波长,对影响偏离大小的各个因素讨论不够全面,而且多数只得出负偏离的结论,论证过程较复杂。本文提出一种新的证明方法,用多波长论证,可以得出正、负偏离的条件。考虑到吸收曲线为连续光谱,设测定时使用的复色光由λ_1、λ_2、λ_3三种波长的单色光所组成,其摩尔 There are four different approaches to the proof of the complex color shift from Beer’s Law. The complex color lights used in these methods have only two wavelengths, and the discussion on various factors that affect the deviation size is not comprehensive enough, and most of them only draw the conclusion of negative deviation. The process of argumentation is complicated. This paper presents a new proof method, using multi-wavelength argument, can be obtained positive and negative deviation conditions. Considering that the absorption curve is a continuous spectrum, the complex color light used in the measurement consists of monochromatic light of three wavelengths λ_1, λ_2, and λ_3, and its molar