3B Scientific U14101 Diaphragm With 4 Double Slits Of Different Spacing

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