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d = 1/5000 ----> 2 x 10^-4
n = 2
Sin 30 = 1/2
maka Panjang Gelombang = ?
2 x 10^-4.= 2.2.panjang gelombang
panjang gelombang = 2 x 10^-4/4
= 0.5 x 10^-4 cm
= 5 x 10^-8 m