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. Author manuscript; available in PMC: 2008 Dec 15.
Published in final edited form as: Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Aug 6;78(2 Pt 1):021901. doi: 10.1103/PhysRevE.78.021901

FIG. 3.

FIG. 3

Geometry of an acoustic negative lens. v′ and v are the speeds of sound in the lens and surrounding medium, respectively. The divergence angle depends on the sound speeds, as well as the geometry of the lens.