1. An optical microphone having a pressure-actuated diaphragm responsive to sound waves impinging thereon, comprising in combination: (a) reflective means attached to said pressure-actuated diaphragm and adapted to move therewith; (b) a light source for directing light having a chosen intensity onto said reflective means; and (c) means for detecting the position of the light reflected by said reflective means and generating a signal therefrom, whereby the generated signal is independent of the intensity of the light.