我仪器站收到一批浙江省某教仪厂生产的白光的色散与合成演示器。由于该仪器是新产品,我们对其作了逐台验收。验收后发现约有半数的仪器,只能演示色散,无法演示合成(合成后仍为七色光),不能使用。经过分析,认为是等边棱镜存在质量问题所致。为了确定故障的真正原因,我们做了一个简易的鉴别实验,如图所示。 I instrument station received a batch of white light dispersion and synthesis demonstrator produced by a teaching facility in Zhejiang Province. Since this instrument is a new product, we made it to Taiwan. About half of the instruments were found after acceptance, and only the dispersion was demonstrated. It was impossible to demonstrate the synthesis (seven-color light after synthesis) and could not be used. After analysis, it is considered that the equilateral prism has quality problems. In order to determine the true cause of the failure, we made a simple identification experiment, as shown in the figure.