Anyone who’s ever played the drums, tuned a guitar, or even made a wine glass “sing” by circling a finger along its edge knows about resonance. Acoustic resonators, like the cavity of a drum or a half-full wine glass, naturally vibrate at certain frequencies of sound waves to produce specific tones. The phenomenon of resonance can also be applied to light waves, with optical resonators being key components of devices such as lasers and sensors.
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Source: Phys.org