Keywords: monochrome black background This is a Helium-Neon laser beam, reflected from a simple glass plate. Because there are two separate reflections from the front and back surfaces of the glass, there is interference, which causes the strong vertical stripes as the two reflections come in and out of phase. This is a Helium-Neon laser beam, reflected from a simple glass plate. Because there are two separate reflections from the front and back surfaces of the glass, there is interference, which causes the strong vertical stripes as the two reflections come in and out of phase. |