Carhart, Henry S. (Henry Smith), 1844-1920 · Boston : Allyn and Bacon · leaf 183
dottedlines ; but they are reflected so as to have the positions of the full lines sym- 0 metrically situated 011 the other side ofthe reflecting surface. Let 01 be asound-ray, or thedirection of motionof any point of theincident wave; drawIM so that IM and01 shall make equalangles with the normal.… … NATURE AND MOTION OF SOUND. 173 of the reflected waves. The triangles QIC and 0IC areequal. Hence 0(7 and 0x(7are equal, and the centres ofthe incident and reflected waves are on a perpendicular tothe reflecting surface and equidistant from it. The sound-centre and sound-image are symmetrically…
Physics
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