A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 723
Fig. 639.—Reflection of sound waves. Fig. 640.—Parabolic reflector. Reflection by curved surface.—In Fig. 639 the reflected waveshave the same curvature as the incident waves ; but when thereflecting surface is itself curved, this is no longer the case. Thus,if the sounding body be placed at F…
Physics
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