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# Lecture18 - ANNOUNCEMENTS"Clicker Pts Hitt02 Points are...

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ANNOUNCEMENTS "Clicker Pts Hitt02" Points are Cumulative Through May 8 Tycho HW #5 Tomorrow Night, #6 Next Thursday May 21 Survey Running Now on Course Web Page (FMCE) Exam #2 Class A Average 61% Class C Average 64% Get Any Regrade Requests In By Friday in Class!

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MULTIPLE SLITS Consider N Equally Spaced Slits Same Same Rotation Angle ϕ for Phasors Representing Any Two Adjacent Slits Each Path Diff = ϕ ϕ ϕ ϕ
PHASOR PROCEDURE 1.Draw Phasor Diagram 2.Any Other Distinct Diagrams? 3. Find Rotation Angle ϕ 4. Find Adjacent Path Difference in Terms of λ 5.Find Ray Angle from Centerline = d sin θ = f λ θ = sin -1 ( f λ /d) 6.Find Location on Screen y = L tan θ Can be Used in Reverse, Too.

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MORE SLITS 3 Slits: ϕ = 120 ° , = λ /3 = d sin θ ϕ = 240 ° , = 2 λ /3 = d sin θ Note: = 3 λ /3 = λ Doesn't Work, But = 4 λ /3 = (4/3) λ Does 4 Slits: ϕ = 90 ° , = λ /4 = d sin θ ϕ = 180 ° , = 2 λ /4 = λ /2 = d sin θ ϕ = 270 ° , = 3 λ /4 = d sin θ
Note: = 4 λ /4 = λ Doesn't Work

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Lecture18 - ANNOUNCEMENTS"Clicker Pts Hitt02 Points are...

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