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PURPOSE: Large interference demonstration for lecture hall use.
DESCRIPTION: Soap film interference is created in a large rectangular area, shown above for sodium light and for white light, using the apparatus photographed below. The light sources are inside the large wooden box, and reflect off the screen to yield a very uniform, broad source. The interference patterns created are very large and possess extraordinarily beautiful saturated colors.
NOTE: The audience views this demonstration from the left in the photograph of the equipment to see the patterns in the photographs at the top above.
SUGGESTIONS: A bit of practice is needed to create the large soap film.
REFERENCES: Available. (PIRA unknown.)
EQUIPMENT: Large wooden frame with large sodium source and built-in white light bulb sources, rectangular frame with pan of soap solution, and large projection screen,assembled on hospital cart.
SETUP TIME: 30 min.
