就是著名的杨氏双缝干涉。1807年,Thomas Young。
http://baike.baidu.com/link?url=F7DwfDMmY7UIAr8f4VUQKaTxOk-nK2wtMCNhnluYFNtsrtCRwXdHh2pBQ2kyjhm3lUrm9NO0VZUqPc6g9hefD96n0zuAR8kVwcpmS3jiynpvyWS6xUj5KQlP1kUMFfwPa_b2uWTsLZ5scHJQ3EZAJ7qO_5oOQiVWn605ipqOtTaPk7BUrof2ZnCM-up5eeygFs-Qzy4o0rsefJinvz4nHK