Radiation force applied on an absorbing disk due to a focused circular beam generated by a focusing transducer is calculated using the ray acoustics approach. It is found that the radiation force is a function of the acoustic power of the beam, the f number of the source transducer, the normalized radius of the absorbing disk relative to the radius of aperture of the source transducer, the separation between the disk and the source transducer, the ratio between the speed of sound in the medium and that in the disk material, and the ratio between the characteristic acoustic impedance of the disk material and that of the medium.
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Junru Wu (1995) studied this question.