trong thí nghiệm Y-âng về giao thoa ánh sáng,nguồn phát ra ánh sáng đơn sắc có bước sóng . khoảng cách giữa hai khe 1mm.nếu di chuyển màn ra xa mặt phẳng hai khe một đoạn 50cm thì khoảng vân trên màn tăng thêm 0,3mm.bước sóng của bức xạ dùng trong thí nghiệm

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