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Introductory Physics Homework Help
Diffraction with a large array of slits
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[QUOTE="Flucky, post: 4758241, member: 373056"] Hi all, exams soon and I'm stressing out over this small question. If anyone could guide me through, explaining why you're doing what you're doing that'd be beyond great. [h2]Homework Statement [/h2] Light of wavelength λ is incident normally on a screen with a large array of slits having equal widths [I]b[/I], and periodically displaced by a distance [I]a[/I]. (i) Find the maximum diffraction order which can be observed using this system of slits. (ii) Find the minimum period a for which diffraction can be observed for light with wavelength λ = 10µm.[h2]Homework Equations[/h2] AFAIK the only equation relevant is [SIZE="3"][I]a[/I]sinθ = mλ[/SIZE] One that has cropped up is [SIZE="3"]sinθ[/SIZE][SUB][SIZE="1"][itex]\pm1[/itex][/SIZE][/SUB] [SIZE="4"]= [itex]\pm\frac{λ}{b}[/itex][/SIZE] , although there is no explanation next to this one so I'm not sure what it means.[h2]The Attempt at a Solution[/h2] Initial thoughts are to set θ = 90° as it's asking for a maximum. Past this I don't know where to go :frown: [/QUOTE]
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Diffraction with a large array of slits
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