Physics Lecture 11

Physics Lecture 11 - o Δr = Δδ/2π = 750 nm HOR VERT 1...

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Physics Lecture 11: Interference I. Constructive and destructive interference II. Phasors a. Phasor – abstract graphical representation of oscillations To add two waves each one represented by a vector Angle between vectors is the phase difference (Δδ) b. example A Tot = Square root of the sum of the squares III. Path Lengths a. Δδ = 2π* Δr/λ IV. Two Source Interference V. Thin Film Interference a. Δr = |r 2 – r 1 | b. If L>>d Δr ~ dsinθ i. Where d is the distance between slits c. Concept test: at second side min Δδ = 3π, θ = 30
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Unformatted text preview: o , Δr = λ*( Δδ/2π) = 750 nm HOR VERT 1 5 2 5cos(π/3) 5sin(π/3) T 7.5 4.33 Given y 1 = A 1 sin(kx – ωt) Y 2 = A 2 sin(kx – ωt + Δδ) y total = y 1 + y 2 represent with phasor addition Δδ = 2π* Δr/λ Where Δr = |r 2 – r 1 | is path length difference If screen very far away or if we want the angle Δr = d*sinθ A T A 2 A 1 Δδ A T 2 1 π/3 R r 1 S 1 r 2 S r 1 r 2 ^central max ^ first min ^ first max second min ^ vvsecond max ^...
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