![Photograph of polaroid](/physics-astronomy/sites/default/files/uploads/images/polaroid.jpg)
![Photograph of polaroid](/physics-astronomy/sites/default/files/uploads/images/polariod2.jpg)
Apparatus:
overhead projector, 3 sheet polaroids, plexiglas, clear tape, cellophane wrap, safety glasses, plexiglas horseshoe
Description:
Using the overhead projector as the light source, place the varioius miscellaneous items between crossed polarizers, including the third polaroid sheet.