Thin Film Interference - HeNe Laser and Air Wedges

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 Code Number :   6D30.35?  

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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 :   Thin Film Interference
Area of Study :  Optics   
Equipment :   Two Glass Plates separated by a width of tape, Helium-Neon Laser (2 to 5 mw.), Diverging Lenses, Optics bench (in place of Stand and Holder).

  
Procedure :   Screw the lenses onto the laser for a large divergent beam. Point this at the angled plates. Observe the reflected patterns on a screen. The interference patterns can be altered by squeezing the plates together.  
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   References
                                                                              O-455:  "Air Wedge Between Glass,"  DICK and RAE Physics Demo Notebook.

 

Thomas B. Greenslade Jr.,  "From our Files: Laser Interference by Convex Mirror,"  TPT, Vol. 41, # 4, p. 250, (April 2003).



Mail Questions and Comments to:  Dale Stille