PHYSICS 7E Lecture Notes - Lecture 26: Diffraction
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PHYSICS 7E - Lecture 26 - Diffraction
*Images from University Physics, Young & Freedman
Two Slits of Finite Width
cosEP=E0λ
πasin θ
sin λ
πasin θ
λ
πdsin θ
●So the intensity relies on the factors
○cos I=Imax 2(λ
πdsin θ )[πa sin θ/λ
sin(πa sin θ/λ) ]2
●Since d>a, the diffraction factor acts as the envelope on the interference pattern
Several Slits
●In Figure below, a lens is used to give a Fraunhofer pattern on a nearby screen
●Multiple slits make the bright fridge narrow
(a) Phasor diagram for ϕ= π
(b) Phasor diagram for ϕ=4
π
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