PURPOSE: Analog to the interference pattern from two identical light sources.
DESCRIPTION: Transparencies consisting of a series of equally-spaced concentric rings or a tight spiral are superimposed on each other. The interference pattern from these two identical sources can be observed as the distance between the two sources is varied. Two sizes of spacings (corresponding to two wavelengths) are supplied.
REFERENCES: (PIRA unavailable.)
EQUIPMENT: Transparencies of concentric circles and a tight spiral.
SETUP TIME: None.
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