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2 năm trước
Chiếu đồng thời hai khe I Âng bởi hai ánh sáng đơn sắc có bước sóng 1=0,5 micromet và bước sóng 2=0,6micromet.Biết khoảng cách hai khe là 2mm,khoảng cách từ hai khe tới màn là 2m,bề rộng vùng giao thoa là 2cm.Tính khoảng cách ngắn nhất giữa vân trung tâm với văn cùng màu
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