用检流计测量透镜焦距

The Measurement of Focal Length of A lens With Galvanometer

介绍用直流复射式检流计测量透镜焦距的原理和方法，它适用于测量凸透镜和凹透镜并且有较高的测量精确度。

The principle and method of measuring focal length of a lens by use of D.C.multiplexreflecting galvanometer are introduced.It is valid for both convex and concave lenses and has a comparative high precision.