薄透镜焦距测定方法的研究

Study on the determination of focal length of the thin lens

对薄透镜测量方法进行深入研究,从理论上分析了物距成像法和自准直法测定透镜焦距的原理,实验中,采用物距法测定凸透镜及凹透镜焦距,并与自准直法测定的焦距相比较,对实验结果进行对比分析得出,运用自准直方法测量的结果实验误差小,实验结果更为准确。

This paper studied methods of measurement of thin lens. It analyzed two common methods for measur-ing focal length of thin lens. The methods include Self-collimation method and Object distance-Image distance method. Object distance-Image distance method was used to measure focuses of convex lens and concave lens with the help of the experiment. Self-collimation method was adopted to determine focuses of the same lens. E x-periments show that Self-collimation method has a simple operating way and produces more accurate results.