薄透镜焦距测量实验中焦深问题的研究

Research on Focal Depth in the Experiment of Thin Lens' Focal Length Measurement

从焦深理论出发,解释了在薄透镜焦距测量实验中无法精确确定像所在位置(像距)的现象,并从理论和实验分析了这一不确定度与物距的关系.根据焦深理论对焦距测量中常采用的两种实验方法(二次成像法和成像公式法)的实验精度进行了分析.结果表明采用成像公式法测量透镜焦距,并且物距较小时,测量的精度较高.

Focal depth theory is employed to be made precisely in the experiment of thin lens explain the phenomenon of image distance that can not focal length measurement. The relationship of object distance and uncertainty of image distance is analyzed in theory and experiment as well as the precision of the two often used methods in the experiment in accordance with the focal depth theory. The result shows that the precision of lens＇ focal length measurement will be higher while using the method of imaging formula and with the less object distance .