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2n - 1 = 2 - 1 = 1
L₂ = 3/4 λ
λ = 4/3 L₂
L₁ = 1/4 λ
λ = 4 L₁
λ = λ
4/3 L₂ = 4 L₁
L₁ = 1/3 L₂
L₁ = 1/3 45
L₁ = 15 cm
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