Diffraction on a screw, Photo 1 of 4. A small screw is placed in a beam produced by either a Helium-Neon laser operating at 632.8 nm (red, Photos 1 and 2) or a Helium-Neon laser operating at 543.4 nm (green, Photos 3 and 4). The resulting Fresnel diffraction patterns are observed at the same distance from the screw. Note that the fringe spacing is smaller for the green laser.

px px dpi = cm x cm = MB
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TOP22293217

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達志影像

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RM

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須由TPG 完整授權

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