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Geometries used for the simulations: (a) reference volume: a water‐filled plane‐parallel volume with a diameter of 10 mm and a height of 0.25 mm, (b) air‐filled plane‐parallel volume with a diameter of 10 mm and a height of 2.5 mm and (c) air‐filled cylindrical volume with a height of 20 mm and a diameter of 6 mm. The direction of the broad beam is marked with black arrows on the left. [Color figure can be viewed at http://www.wileyonlinelibrary.com/]
