Figure 10. Photo image and schematic rendering of light strands radiating from pinhole in cylindrical sheaths, creating concentric rings in cross section

From

Light Strands: Visualization of Free Space in Double Slit Diffraction

S. Dutt, N. Dutt, A. Dutt

International Journal of Physics. 2021, 9(4), 197-205 doi:10.12691/ijp-9-4-2