1. Polarizing Filters
Examine the two polarizing filters (polarizers) by holding them up to room light
with one polarizer in front of the other. Slowly rotate one polarizer while
keeping the second stationary. Observe the relative intensity of the light.
2. Light Emitting Diodes, Diode Lasers, and Polarizers
Examine an LED through a polarizer. Slowly rotate the polarizer and observe
the relative intensity of the light from the LED.
CAUTION: In the next experiment, which uses a diode laser, do not look directly at the laser beam. Also, watch where you are directing your laser so that it is not directed at someone else.
Shine the diode laser through a polarizer onto a wall. Slowly rotate the polarizer, and observe the relative intensity of the laser spot.
3. Water, Corn Syrup, and Polarizers
Place a large polarizer on the stage of an overhead projector that has been
turned on. Take two identical beakers and fill one with water and one with corn
syrup to the same height. Place a second large polarizer so that it covers the
tops of the two beakers. Observe how much light is transmitted as the upper
polarizer is rotated.
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