题目内容

在单缝夫琅禾费衍射实验中，若增大缝宽，其它条件不变，则中央明条纹：（）

A. 宽度不变，且中心强度也不变；
B. 宽度不变，但中心强度增大；
C. 宽度变大；
D. 宽度变小。

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根据光源、衍射屏和接收屏的位置，可把衍射现象分为两类。分别为()和（）

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