Purpose:Demonstrates total internal reflection of a laser beam in a water jet
Description:The upper vessel is filled with water, with a trace of particulates to make the laser beam more visible. Align the laser beam so that it is centered in the port through which the water leaves the container. Several internal reflections of the laser beam are clearly visible in the outgoing stream of water, down to the point where it becomes too turbulent to see clearly. As the water level in the dank drops, the water flow becomes so slow that the stream bends too sharply and there is no internal reflection. The overall effect can be easily seen throughout the lecture hall.