论文部分内容阅读
[实验目的]掌握测量凸透镜焦距的几种方法.[实验原理]1.平行光聚焦法:平行于凸透镜主轴的光线,经折射后会聚于焦点.2.公式法:使发光体经凸透镜成实像于光屏上,测出此时的物距u和像距v,代入公式1/u+1/v=1/f即可求出焦距f.3.共轭法:保持发光体和光屏之间的距离L(L>4f)不变,在发光体和光屏之间移动凸透镜,使发光体在光屏上先后两次成像,测出两次成像时凸透镜的两个位置间的距离d,则凸透镜的焦距f=L~2-d~2/4L.
[Experimental purpose] To master several methods for measuring the focal length of a convex lens. [Experimental principle] 1. Parallel light focusing method: rays parallel to the principal axis of the convex lens converge after being refracted. 2. Formula method: Make the luminous body through the convex lens into a real image. On the screen, measure the object distance u and the image distance v at this time, and substitute the formula 1/u+1/v=1/f to find the focal length f.3. Conjugate method: to maintain the light and light screens The distance L (L>4f) is constant, and the convex lens is moved between the light emitter and the light screen so that the light emitter is imaged twice in succession on the light screen and the distance d between the two positions of the convex lens is measured twice. The focal length of the convex lens is f=L~2-d~2/4L.