36 diffraction

36 diffraction - Craig Ogilvie Craig Ogilvie 11 ) sin( d L...

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Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 ) sin( 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 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 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 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( d L...

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