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Same double-slit assembly (0.7 mm between slits); in top image, one slit is closed. In the single-slit image, a diffraction pattern (the faint spots on either side of the main band) forms due to the nonzero width of the slit. This diffraction pattern is also seen in the double-slit image, but with many smaller interference fringes.
I once made a diffraction grating using wires (separated by the threads of two bolts)It didn't work properly until I painted it black.The reflections from the curved surfaces of the wires made the diffraction pattern more complicated.You may encounter similar issues with needles.