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I need to calculate the radius of curvature of a reflector.I have a sound source (Ultrasonic transducer of 40 mm operating at 50 Khz) in air . I am trying to generate a standing wave using this sound source .As curved reflectors can help to amplify the sound pressure (I actually don't exactly understand why ,it would be helpful if you can help me to visualize), I need to calculate the radius of curvature.

As it should be analogous to reflection of light as well, I was wondering if there is a way to calculate desired radius of curvature If I know the wavelength.

Thanks