题干
把微小放大以利于观察，这是物理学中一种重要的方法．如图是一种显示微小形变的装置，A为激光笔，B、C是平面镜，P为台面，未放置重物时，激光束反射在屏上的光斑为点D，当把重物M放在台面P上时，台面将发生微小形变，此时平面镜B上的入射角____（选填“变大”“变小”或“不变”），光斑向D点的____（选填“左”或“右”）侧移动，与此研究方法相同的实验：____（写出实验名称）．
答案(点此获取答案解析）
变大,右,探究声音是由振动产生的实验
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