1 (b) A narrow street between the fronts of houses or businesses. 2  This type of alley is found in the older parts of many cities, including American cities like Philadelphia and Boston (see Elfreth's Alley, Philadelphia, Pennsylvania). 3  Many are open to traffic.
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A wavefront is a surface over which an optical wave has a constant phase. For example, a wavefront could be the surface over which the wave has a maximum (the crest of a water wave, for example) or a minimum (the trough of the same wave) value. Th...