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Key Equations

Constructive interference Δl=mλ,Δl=mλ, for m = 0, ±1, ±2, ±3…
Destructive interference Δl=(m+12)λ,Δl=(m+12)λ, for m = 0, ±1, ±2, ±3…
Path length difference for waves from two slits to a common point on a screen Δl=dsinθΔl=dsinθ
Constructive interference dsinθ=mλ,form=0,±1,±2,±3,…dsinθ=mλ,form=0,±1,±2,±3,…
Destructive interference dsinθ=(m+12)λ,form=0,±1,±2,±3,dsinθ=(m+12)λ,form=0,±1,±2,±3,
Distance from central maximum to the mth bright fringe ym=mλDdym=mλDd
Displacement measured by a Michelson interferometer Δd=mλ02Δd=mλ02
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