寒假伊始，笔者带领初中物理小组去郊外，动手制作了冰透镜，并成功采集出火种（当时气温－２０℃），令人喜悦、激动，建议一试，其做法如下。 １．取样：尽量采集透明效果好，内部无气泡、杂质、裂纹的冰块为宜（用容器冻出的冰效果欠佳）。 ２．整形：用刀具轻轻将冰块砍、 At the beginning of the winter vacation, the writer led the junior high school physics team to the outskirts of the country to make an ice lens and successfully collected the fire (at the time, the temperature was -20°C). It was a joy and excitement. It is recommended to try it. The practice is as follows. 1. Sampling: It is advisable to collect the transparent effect as much as possible, and it is advisable to have no bubbles, impurities or cracks in the ice (the ice that is frozen in the container is not good). 2. Shaping: Use a knife to gently cut the ice cubes.