When I wake up in the morning and look at my curtains, I see a pattern on the ceiling made by the light going through the gap between my curtains. I have added a picture of it below. I remember from high school that when a laser was being shot through a very thin slit, that you would get a similar pattern. However, I see two important differences here:
- This is regular divergent sun light instead of parallel single wavelength light from a laser.
- The gap in my curtains is orders of magnitude thicker than the gap in a slit experiment.
So if this is not a diffraction pattern caused by the wave particle duality of light, then what is causing this pattern to appear on my ceiling?
Edit: Okay, so I looked again at the light pattern and the building across and now think that the vertical white beams are causing the pattern. The light pattern is just the horizontally mirrored reflection of those white beams. The part of the building in the front right has 6 beams, which correspond to the 6 bright beams of light. The back left has a lot more beams which are further away and seem thinner because of it, so those we see on the right in the picture.
Now I am wondering why the horizontal white beams are not showing up on my ceiling.