University of Virginia Physics Department Polarized Filters A Physical Science Activity

Student Activity

Materials

• a light probe
• computer or CBL (calculator based laboratory)
• interface box (connects the probe with the computer)
• light source (such as a light bulb)
• large cardboard tube with slots to hold the filters
• 2 polarized filters

Procedure

1. Gather the materials and set up as shown:
   
   
2. The probe and light source need to remain in the same position for all of the trials.
3. For each of the following conditions, repeat three times. Measure the amount of light detected through the tube without any filters. Record data.
   *For each trial, read the computer to get the light intensity. Under "data" on the toolbar, click on "collect" when you have the filters set and are ready to collect data.
4. Place one filter into the slot and measure the amount of light detected through one filter. Record.
5. Turn that filter 90° and measure the amount of light detected. Record.
6. Return that first filter to its original position and place the other filter directly behind it. Measure the amount of light detected.
7. Turn the second filter 90° and measure the amount of light.
8. Record class data and analyze your results.
   
   

Data Sheet

To print out the Data Sheet only, click here.