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# Lecture19 - ANNOUNCEMENTS Tycho HW#7 Posted Yesterday...

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ANNOUNCEMENTS Tycho HW #7 Posted Yesterday Afternoon, Due Next Thursday Night May 21 New WebAssign #7 Coming Soon Exam #2 Statistics Are Posted on the “Main 1XX Page” Current Survey (FMCE) Expires Saturday, New One Coming Soon Clicker Points “Hitt02” Absolute Max = 170 , Truncated Max = 128, {Do NOT Add Hitt01 + Hitt02}

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SINGLE SLIT Model as N Equally Spaced Very Narrow Adjacent Slits Use Very Large Number (N) of Phasors Width = a
MORE SINGLE SLIT At First Totally Dark Spot to Left (or Right) of Center of Screen, the N Phasors Make a Circle. On Opposite Sides of the Circle, Phasors Differ by 180 ° . Thus Light from One Edge of the Slit Cancels Light from the Middle of the Slit, etc. All Light Cancels by Pairs of Phasors Separated by ½ Slit Width (a/2) (a/2) sin θ = λ /2

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SON OF SINGLE SLIT At Second Totally Dark Spot to Left (or Right) of Center of Screen, the N Phasors Make a Double Circle. On Opposite Sides of Each Circle, Phasors Differ by 180 ° .
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