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ptthanh
2 năm trước
Thực hiện giao thoa ánh sang với khe dân a=1,5mm D=3m dung ánh sang có bước sóng λ= 0,4μm a)tính khoảng vân, xác định vị trí vân sang vân tối bậc 5 trên màng b)ở tọa đô x=3,2mm thì là vân sang hay tối thứ mấy c)biết bề rộng giao thoa trên màng là 40mm tính số vân sang tối thấy đc trên màng d) dùng đồng thời 2 bức xạ λ trên và λ’=0,6μ. Xác định khoảng cách ngắn nhất giữa 2 vân sáng có màu giống vs màu vân sáng trung tâm
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