中文摘要：

在牛顿环干涉实验中,若在平凸透镜的凸面与平玻璃板间加入少许液体,可将液体膜局域等效于液体劈尖,则液体膜可看成是沿平凸透镜的凸面与平玻璃板接触点向外的径向线性增加的液体劈尖,利用液体劈尖的等厚干涉理论可推导出平凸透镜的曲率半径与光波波长间的关系式,进而得到液体折射率与空气膜及液体膜产生的干涉圆环直径间的关系式。利用此关系式可知,只要不改变实验装置,在未知凸透镜曲率半径和光波波长的情况下,分别测出在同一牛顿环装置下液体膜和空气膜的任意相邻干涉圆环的直径,即可方便地测出液体的折射率。

英文摘要：

A simple method for measuring liquid refraction index with interference antitheses was put forward in this paper. In Newton ring interference experiment, if adding a little liquid between the convex flat glass and flat raised face, liquid membrane local area was equivalent to liquid split wedge. The liquid membrane colud be seen as the burniug along tile flat raised face and flat glass to the contact point of the linear inc.reasing liquid radial split wedge. The relational expression between convex curvature radius and light wavelength could be deduced by using the equal thickness interference theory of liquid split wedge, and then the relational expression between liquid refractive index, air film and interference circle diameter which was produced by liquid membrane could be obtained. Therefore, as long as the experiment device was not changed, under the conditions.of unknown convex curvature radius and light wavelength, adjacent interference circle diameter between the liquid membrane and air film in the same Newton ring were measured respectively, the liquid refractive index could be easily detected.