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Some common examples of cavity resonators include the klystron tube in a microwave oven (see also magnetron), the tube of a flute, and the body of a violin (this latter also being an example of a Helmholtz resonator).
In a laser, light is amplified in a cavity resonator which is usually composed of two or more mirrors. Thus an optical cavity, also known as a resonator, is a cavity with walls which reflect electromagnetic waves ( light). This will allow standing wave modes to exist with little loss outside the cavity.