

Two identical transmitting antennas for microwaves (shiny strips mounted on meter stick) are driven by the same source, creating two coherent sources. Scanning the region in front of the two sources reveals an interference pattern, which can be seen by a class using a projection meter connected to the microwave receiver.
The photograph at the left shows the receiving antenna at the central maximum; at the right the receiving antenna is at the first minimum.
Demonstrate single slit diffraction. Read More
Demonstrates single slit diffraction
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Show diffraction by wires of different size. Read More
See single slit diffraction. Read More
Demonstrate laser diffraction with a human hair. Read More
Demonstrates double slit interference
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Analog to the interference pattern from two identical light sources. Read More
Model interference between two point sources. Read More
Demonstrate interference using microwaves. Read More
Illustrate two-slit interference using microwaves. Read More
Show explicitly how two waves with the same amplitude and frequency will interfere when their relative phase changes. Read More
Show the transition from one slit to multiple slits and the diffraction grating. Read More
Demonstrate diffraction (well, actually interference) by a grating. Read More
Diffraction and interference by various slits and combinations of slits. Read More
Demonstrate interference of a laser beam by a type of grating. Read More
Demonstrate interference of a laser beam by a type of grating. Read More
Demonstrate diffraction of a laser beam by a standard videodisc. Read More
Demonstrate a type of iridescence. Read More
Demonstrate a type of iridescence. Read More