15.4 Interference of Microwaves
Using wavelength microwave equipment (Fig. 15.6), we can observe an interference pattern. The microwave transmitter is directed towards the double gap in a metal barrier. The microwaves are diffracted at the two gaps so that they spread out into the region beyond, where they can be detected using the probe receiver. By moving the probe around, it is possible to detect regions of high intensity (constructive interference) and low intensity (destructive interference). The probe may be connected to a meter, or to an audio amplifier and loudspeaker to give an audible output.
(Fig. 15.6: Microwaves can also be used to show interference effects.)