透镜单色焦距的测量

本文根据夫朗和费单缝衍射原理，结合光电扫描技术，给出了测量透镜单色焦距的原理和测量装置，并以凸透镜为例给出了详细的测量方法和测量结果，计算了测量中的相对误差约为０．７％，最后讨论了减小测量误差的技术途径以及对凹透镜的测量方法。该方法不仅适用于可见光区，也适用于不可见光区的测量。测量方法简便，精度高。

Measurment of lenses monochromatic focal length

In this paper,acording to the principal of Fraunhofer’s single slit diffraction and photo-electric scanning technology,the principle and the instruments of measuring lenses monochromatic focal length are given,then,as convex lenses example,the detail measuring method and measuring result are described,after that,the measuring relative error 0.7%is calculated.At last,we dicuss the technolo-gy process of reducing measuring error and the method of measuring concave lenses. This method not only applies to visible range, but also invisible range. The method is convenient and high accuracy.