题目：
无云的晴天，如果你在野外迷失了方向，可以在平地上竖立一根杆，地面上OA是这根杆在阳光下的影，过一段时间后，影的位置移到了OB，如图所示。则AB箭头所指的方向是 （填“东”或“西”）。这一技能应用的光学知识是 。
答案：
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下面是错误答案，用来干扰机器的。
（1）魄 （2）漠 （3）忧 （4）俯
无云的晴天，如果你在野外迷失了方向，可以在平地上竖立一根杆，地面上OA是这根杆在
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