1. Connect the PASPORT interface to the USB port of the computer and plug the Light Sensor into the interface.

2. Attach the Light Sensor to the Aperture Bracket by screwing the "skinny post" underneath the Aperture Bracket.
   
   
3. Attach the Aperture Bracket to the Aperture Bracket Holder as in the picture above. Place this assembly on the Optical Bench.
   
   
4. Slide the Light Sensor assembly until the front is over the 10 cm mark on the Optical Bench.
   
   
5. Remove the diffuser from your line source.
   
   
6. Place the line source over the 0 cm mark of the Optical Bench. Make sure its height is even to the Light Sensor.
   
   
7. Turn the line source on.
   

8. Turn the dial of the Aperture Bracket to the translucent setting as in the picture above.
   

9. Select the "Candle" setting of the Light Sensor.
   
   
10. Dim or turn off as many lights as possible in your room. Make sure your line source is on.
    
    
11. Click the Start button; the Keep/Stop button will appear in its place.
    
    
12. Observe the value of the Light Intensity in the Digits Display.
    
    
13. Beginning from the 10 cm mark move the Light Sensor away from the source until the magnitude of the Light Intensity begins to change.
    
    
14. Click the Stop button (the red square next to the Keep button).
    
    
15. From the Experiment Menu, select "Delete All Data Runs."
    

For the Point Source

1. Place the light source on the optics bench such that the notch on the bracket is aligned with 0 cm. The notch represents the location of the light bulb inside the light source box (see photo below).
   

Download the "Light Intensity" DataStudio files:
    Windows (Zip file) or Macintosh (Stuffit file).

Download the "Light Intensity" Microsoft Word files:
    Windows (Zip file) or Macintosh (Stuffit file).