| 摘要 |
Blocks 20 interlock at cutouts 24 to form a row of blocks. Waves with wave crests 44 propagate in the direction of arrow A towards the blocks. When the waves impact the row of blocks 20 , the alternating peaks and troughs formed by the edges 22 , facets and steps of blocks 20 cause reflection of the waves from a plurality of point sources such that the reflected waves have circular wave fronts 46 . The wave interference of the circular wave fronts 46 in the regions shown by reference numeral 48 results in a phenomenon known as near field diffraction. Circular wave fronts 46 also interfere with waves 44 . This reduces the wave intensity impacting the blocks.
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