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【多选题】
如图所示是观察水面波衍射的实验装置 , A C 和 BD 是两 块挡板 , AB 是一个 , O 是波源 , 图中已画出波源所 在区域波 的传播情况 , 每两条相邻波纹 ( 图中曲线 ) 之间距离表示一个波 长 , 则波经过之后的传播情况 , 下列 描述正确的是A.
此时能明显观察到波的衍射现象
B.
挡板前后波纹间距离相等
C.
如果将 A B 扩大，有可能观察不到明显的衍射现象
D.
如果的大小不变，使波源频率增大，能更明显地观察到衍射现象
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