Inverse Square Law - Diffuse Light Source


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 Code Number :   6B10.20

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Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

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Condition :   Good  
Principle :   Inverse Square Law
Area of Study :  Optics  
Equipment :   Overhead mask with 4" hole, tracing paper screen, light meter.

 

Procedure :   Put the mask with the 4" hole on the overhead projector and cover the hole with the tracing paper screen.  Measure the diffuse light coming from the screen with the light meter at measured distances.
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   References

Robert Ehrlich,  "Departures from the Inverse-Square Law,"  Turning the World Inside Out, p. 154-155.



Mail Questions and Comments to:  Dale Stille