日蚀,这多载难逢的壮观场面,不仅向我们展现了天体的一种运动规律,同时,也是给我们上了一堂生动的光学课。对日蚀的形成,从几何光学的角度去解释。教师在黑板上对其原理做出解释并非难事,可惜这给学生留下的印象不会很深,组织学生观察日蚀,机会又太少。于是,我设计了一套简易装置,使之能在实验室将“日蚀”再现。装置如下:如图,A是一个节日里用过的内装电灯 The solar eclipse, this spectacular scene that is not uncommon, not only showed us a movement of the celestial bodies, but also gave us a vivid optical course. The formation of solar eclipses is explained from the perspective of geometric optics. It is not difficult for teachers to explain their principles on the blackboard, but unfortunately it will not leave students with deep impressions. Organizing students to observe the eclipse will have too few opportunities. So, I designed a simple device that would enable the “eclipse” to be reproduced in the laboratory. The device is as follows: As shown in the picture, A is a built-in electric light used in the holiday season.