Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 68
ch arecut off on one side only. If there are an even numberof these latter they will neutralise one anothers effect,and the intensity will be the same as at the centre, M. If an odd number of these half zones are cut off oneextra half zone will be effective. This will be the zoneimmediately within… … Fig. 38.zone. The total effect in this case, therefore, will beone-half of the first complete zone plus one-half of thezone immediately within it. The result will be darkness,for these two half zones will mutually destroy oneanothers effect. As the point P moves away from Mon either side it will…
Light
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