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phungphuongthanh
2 năm trước
Giải giúp em câu này với ạ. Trong thí nghiệm Young về giao thoa ánh sáng, khe hẹp S phát ra đồng thời hai bức xạ đơn sắc khác nhau thuộc vùng ánh sáng nhìn thấy có bước sóng lần lượt là λ1=0,75µm và λ2 chưa biết. Khoảng cách hai khe hẹp a=1,5mm, khoảng cách các khe đến màn D=1m. Trong khoảng rộng L=15mm quan sát được 70 vạch sáng và 11 vạch tối. Tính λ2 biết hai trong 11 vạch tối nằm ngoài.
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