EQUIPMENT
    Glass Cylinder
    Laser or Lamp
    Small Hole Collimator
    Soap Solution




NARRATIVE
            Fill the cylinder with water. Add a capful of soap to the water and stir. Attach the small hole collimator to the light source and direct the light beam through the solution. View the beam through a Polaroid filter (analyzer) while rotating the filter. At two certain positions, the beam will be completely cancelled.

            A Laser can be substituted for the Lamp and Collimator.