path difference =30m
Δ\DeltaΔ = constructive inference =nλn\lambdanλ
=destructive inference =2n+12λ\dfrac{2n+1}{2}\lambda22n+1λ
hence Δ\DeltaΔ =30m
= 32∗20\dfrac{3}{2}*2023∗20
=2(1)+12λ\dfrac{2(1)+1}{2}\lambda22(1)+1λ =2n+12λ\dfrac{2n+1}{2}\lambda22n+1λ
hence there will be destructive wave inference
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