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GELOMBANG CAHAYA• difraksi
N = 5000 celah/cm
θ = 30°
m = 2
λ = __?
d = 1/N
d = (1/5000) × 10^-2 m
d = 2×10^-6 m
d sin θ = m λ
λ = d sin θ / m
λ = 2×10^-6 • ½ / 2
λ = 5×10^-7 m = 5000 A ← jwb