Vote
Demonstration of an optical technique that allows us to see small changes in the index of refraction in air. A point source of light is reflected from a concave mirror and focused onto the edge of a razor blade, which is mounted in front of the camera. Light refracted near the mirror and intercepted by the blade gives the illusion of a shadow.Seen here are the heated gases from a candle flame and a hair dryer, helium gas, and sulfur hexafluoride gas.
Posted 1 day ago by Mamok in category: interesting   Comments (0)


Vote
Posted 1 day ago by Jagerbomb in category: animals   Comments (2)


Vote
Posted 1 day ago by StiflersMom in category: beautiful   Comments (0)



Vote
Posted 1 day ago by boyt in category: funny   Comments (0)


Vote
In board of a cessna 172 on april 25, we had an engine failure over the highway 10 in Quebec, Canada.
Posted 1 day ago by boyt in category: misc   Comments (0)