Light & Color

Rotating Light

The visitor, looking through a polaroid filter, stares down into a cylinder of syrup with another piece of polaroid beneath it. As the level of the syrup is changed with a knob in front of the exhibit, various colors can be observed. Only by rotating the hand-held polaroid can the visitor see the same color as the level is changing, thus demonstrating that the plane of polarization is rotated by the syrup.