凸透镜的焦距是指焦点到凸透镜中心的距离。怎样用实验的方法测出它的焦距呢?(新课程标准实验教材人教版P62、1)。1平行光会聚焦点法器材:焦距未知的凸透镜、刻度尺、白纸屏原理:太阳光经凸透镜折射后,将会聚一点,如图1方:法:将待测焦距的凸透镜正对着太阳光,再把白纸屏放在另? The focal length of the convex lens refers to the distance from the focal point to the center of the convex lens. How to use the experimental method to measure its focal length? (New curriculum standard experiment teaching material P62, 1). 1 Parallel light focusing point method: Convex lens with unknown focal length, scale, white screen principle: After the sunlight is refracted by the convex lens, it will gather a little, as shown in Figure 1: Method: The convex lens of the focal length to be measured is facing the sunlight , And then put a blank screen on another?