36 diffraction

36 diffraction - Craig Ogilvie Craig Ogilvie 11 sin θ d L...

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Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 ) sin( θ d L = ∆ If ∆ L = one or two or three wavelengths… then waves will arrive at screen in phase x constructive interference if 2,..... , 1 , ) sin( ± ± = = ∆ = m d L m θ λ Summary Lecture 35: Interference Craig Ogilvie Craig Ogilvie 22 Goal (Today and Friday) § Interference from many waves instead of just two § Wave aspect of light provides fundamental limitations on – narrow beams of light (today) » communications – ability to recognize two neighboring objects (Friday) Craig Ogilvie Craig Ogilvie 33 “Diffraction” Gratings, a.k.a. Multi-slit Gratings § Many slits, each separated by “d” constructive interference if 2,..... , 1 , ) sin( ± ± = = ∆ = m d L m θ λ Light of different wavelengths will have an interference maximum at different angles Spectrometers: measure angle, know d => provide wavelength of light DEMO Craig Ogilvie Craig Ogilvie 44 H 2 m=0, all wavelengths constructively interfere m=1 , each λ ηασ α χονστ ρυχτ ιω ε ιντ ερφ ερενχε ατ α διφ φ ερεντ ανγ λε Demo/question: one round 1 2 61% 39% atoms give off light at certain wavelengths => quantum physics what are these lines?...
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36 diffraction - Craig Ogilvie Craig Ogilvie 11 sin θ d L...

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