科学发现室小实验、会变魔术的箭头

哈佛幼儿园

<p style="max-width: 100%; clear: both; min-height: 1em; font-family: -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; letter-spacing: 0.544px; white-space: normal; color: rgb(62, 62, 62); font-size: 16px; text-align: center; word-wrap: break-word !important;"><strong style="max-width: 100%; word-wrap: break-word !important;"><span style="max-width: 100%; color: rgb(0, 82, 255); word-wrap: break-word !important;">小</span><span style="max-width: 100%; font-size: 14px; color: rgb(0, 82, 255); word-wrap: break-word !important;">朋友<span style="max-width: 100%; font-size: 16px; word-wrap: break-word !important;">!</span></span></strong><br style="max-width: 100%; word-wrap: break-word !important;"></h3><p style="max-width: 100%; clear: both; min-height: 1em; font-family: -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; letter-spacing: 0.544px; white-space: normal; color: rgb(62, 62, 62); font-size: 16px; text-align: center; word-wrap: break-word !important;"><span style="max-width: 100%; font-size: 14px; word-wrap: break-word !important;">你知道箭头也会 <span style="max-width: 100%; font-size: 16px; word-wrap: break-word !important;"><strong style="max-width: 100%; word-wrap: break-word !important;"><span style="max-width: 100%; color: rgb(0, 82, 255); word-wrap: break-word !important;">变魔术</span></strong></span>吗？</span></h3><p style="max-width: 100%; clear: both; min-height: 1em; font-family: -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; letter-spacing: 0.544px; white-space: normal; color: rgb(62, 62, 62); font-size: 16px; text-align: center; word-wrap: break-word !important;"><span style="max-width: 100%; font-size: 14px; word-wrap: break-word !important;">非常<span style="max-width: 100%; color: rgb(0, 0, 0); word-wrap: break-word !important;">有趣</span>的现象，孩子们想不想知道怎么回事呢？</span></h3> <h3>实验、会变魔术的箭头</h3><h3>实验物料：A4白纸、记号笔、透明玻璃瓶、水。</h3> <h3>实验步骤： 1、用记号笔在白纸上画两条粗粗的箭头 2、玻璃瓶内装满自来水 3、将玻璃瓶放在画有箭头的纸前，让孩子观察箭头的方向，移开玻璃瓶再观察。非常有趣的现象，孩子们觉得好神奇！<br></h3> <h3>实验分析：箭头改变方向是因为杯子和水起了作用（为了让孩子真实地感受到是水起了作用，把水倒掉后再操作一次看看）。它们就像是凸透镜，光线经过折射之后，除了经过光心的光线不改变方向，其它方向的光线都会改变方向。 <br></h3>