“消失”的指甲刀

• 作 者: 祝海峰
• 机 构: 河北省吴桥县教育局教研室,
• 出 处: 农村青少年科学探究
• 发表日期: 2016年12期
• 关键词: 塑料盆 初中物理 折射现象 反射光线 光密介质 光疏介质 折射光线 入射光线 中射 激光灯

今天给大家表演一个小魔术:取一个塑料盆装满水,将一个指甲刀放到塑料盆中(如图1);再取一个玻璃瓶,将玻璃瓶口朝下慢慢扣到指甲刀上。奇迹出现了,从玻璃瓶侧面看,指甲刀“消失”了(如图2)!但从瓶底看,指甲刀还好好地在那里(如图3)。这是什么原因呢?学过初中物理的你可能会想到这是光的折射现象。但我可以

Show you a little magic today: Take a plastic basin full of water, put a nail clipper into a plastic basin (Figure 1); then take a glass bottle, the glass bottle mouth slowly snap down to nail clippers . Miracles appeared, from the side of the glass bottle, nail clippers “disappeared ” (Figure 2)! But from the bottom of the bottle, nail clippers are still well there (Figure 3). What is the reason? You may think of junior high school physics as a refraction of light. But I can