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pantyhose as a diffraction grating

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Uploaded by on Aug 16, 2009

By putting pantyhose in front of a laser pointer, you can make a (rather crappy) diffraction grating. Then, when you stretch the pantyhose in the vertical direction, the pattern enlongates in the horizontal direction. Why? Keep in mind the diffraction pattern (assuming far field) is a Fourier Transform of the grating pattern!

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Education

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