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Diket :Jumlah garis gelap, n = 16
Panjang gelombang warna hijau, λ = 5000 Å = 5000 x 10^-10 m = 5 x 10^-7 m
Tanya :
Tetapan kisi, d = __?
Atau jumlah goresan, N per 1 mm = __?
Jawab :
d.sin θ = n.λ
d• sin 90° = 16 • 5 x 10^-7
d•1 = 80 x 10^-7
d = 8 x 10^-6 meter
Atau
d = 8 x 10¯³ mm
1/N = 8 x 10¯³ mm
N = 1/(8 x 10¯³ mm)
N = 10³/8 goresan / mm
N = 125 goresan per mm
Jawaban : E
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