That darn vortex ring

In retrospect we could have made this look a little more professional

Despite a  plea to the internet community at large in a previous posted titled “Vortex rings – suggestions please” no one came forward with any explanation of my splitting vortex rings. As popular as our little blog is, it wasn’t popular enough to reach any fluidics experts that could help us. To be honest, I had written this whole problem off a while back and that post was my last attempt at getting an answer before filling it into a folder on my computer called “things to solve when time = ∞”, a folder that is growing to slowly fill Continue reading

Brewster angle Lego microscope

Lego BAM

Brewster’s angle is the angle at which light of a certain polarisation won’t reflect off a surface. The resulting reflection will then be made up of only light from a single polarisation (p-polarised). This little optical quirk is how polarised lenses remove lots of scattered reflections in photographs and why polarised sunglasses are so much better when lounging by the seaside. However, rather than just being something that makes sunny days even better, it also provides a neat trick for visualising things that would otherwise be invisible to other analytical methods. Brewster’s angle for water is approximately 53.1°, which is calculated Continue reading