toi la GV vat ly, xin tra loi cau hoi cua ban nhu sau:
de bai toan cho:
a = 1mm
D = 1m
L = 30 mm
λ1 = 0,6 micromet
λ2 = 0,5 micromet.
hoi so van sang n trong truong giao thoa L?
tra loi:
bai toan nay la bai toan tim so van trung nhau cua 2 anh sang trong truong giao thoa L, no co 2 dang:
dang truong giao thoa nam o mot phia so voi van trung tam (dang 1)
dang truong giao thoa co van trung tam o ngay chinh giua truong giao thoa (dang 2)
theo bai toan, day la dạng 2
n = L/x + 1
voi x la khoang cach tu van trung tam den vi tri 2 van sang trung nhau lan thu nhat.
ta tim x nhu sau:
dieu kien hai van sang trung nhau:
k1.λ1 = k2.λ2
suy ra: λ1:λ2 = k2:k1 = 6:5.
vay vi tri hai van sang trung nhau lan thu nhat ung voi k1 = 5 va k2 = 6
x = k1.λ1.D:a = 5.0,6.1:1 = 3 mm
vay ta chon KQ ji nhi?
ta chon D (11 van)
neu ban muon biet vi sao co cong thuc n = L/x + 1 co the hoi truc tiep qua email cua toi.
my email:
boyfriend7777777@yahoo.com
