Demo 22-07 Small Refraction Tank

This demonstration uses a light bulb immersed in a water tank to illustrate the refraction of light. A light positioned in an opaque tank is not directly visible, because the light does not bend around and over the front edge of the tank. When the tank is filled with water, the filament becomes visible because the bending of the light toward the observer as it leaves the water allows it to reach the observer, as shown in the video. Figure 1 shows both cases, without water at the left and with water at the right