“水流导光”实验的实验装置如图1所示[1]。本实验由于选材简单、操作方便、现象明显,是演示光的全反射现象的一个理想实验。然而要做好这个实验,却也并非易事,实验中很多看似细微的操作都有可能造成实验的失败。如何才能做好这个实验?本文将通过理论分析和实验验证两方面来探讨这个问题。 “Light guide ” experimental experimental device shown in Figure 1 [1]. This experiment is a ideal experiment to demonstrate the total reflection of light due to the simple material selection, easy operation and obvious phenomenon. However, to do this experiment, but it is not easy, many seemingly subtle operation in the experiment may result in the failure of the experiment. How to do this experiment? This paper will explore this issue through theoretical analysis and experimental verification.