Diaphragm with 4 Double Slits of Different Spacings
American 3B Scientific U14100 Diaphragm with 3 double slits of different widths)
Single Slit Double Slits, with Holder Observation Board Red Light Source, Optics Elements, Optical Physical Experiment Kit, Interference Diffraction Grating Sheet 50 * 50mm
3B ScientificU14101 Diaphragm With 4 Double Slits Of Different Spacing
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