Glass plates with 7 sets of slits and bars of different widths for quantitative diffraction experiments.
Diameter of support: 40 mm
Irregularities: <1 µm
Slit widths: 30, 40, 60, 80, 100, 150 and 200 µm
Bar widths: 30, 40, 60, 80, 100, 150 and 200 µm
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![Ruled gratings, 1000600 [U14104], Apertures, Diffraction Elements and Filters](/thumblibrary/U14104/U14104_01_140_140_Ruled-gratings.jpg)
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for investigating oscillations and resonances, 1000701 [U56001], Oscillations](/thumblibrary/U56001/U56001_01_140_140_Vibration-generator-for-investigating-oscillations-and-resonances.jpg)