学生在初学使用单筒显微镜时,极易紧闭一只眼,用另一只眼观看视野下的物体。这样不能同时记录视野下的物体参数,不能准确画下物体图象,时间一长,眼睛易疲劳。我用水蚤作为训练学生张开双眼使用单筒显微镜的材料,效果很好,现介绍如下: 一、练习调节焦距找物象在凹玻片中滴加一滴水。取水蚤一只,盖上盖玻片,吸去水分少许,使水蚤不再游动但仍在水中。在低倍镜下找到水蚤,并在水蚤黑色眼的下方、躯干部背侧找到正在搏动的椭园形的心脏。 When a student uses a monocular microscope for beginners, he or she can easily close one eye and use the other eye to view objects in the field of view. In this way, the object parameters in the visual field cannot be recorded at the same time, and the object image cannot be accurately drawn. Over time, the eyes become fatigued. I use leeches as a training material for students to open their eyes with a monocular microscope. The results are as follows: 1. Practice adjusting the focus to find objects. Add a drop of water to the concave slide. Take one bottle of water, cover it with a cover glass, and suck a little water so that the otters no longer swim but are still in the water. Find the otters under the low magnification and find the pulsating elliptical heart below the black eyes of the otters and on the back of the trunk.