Two loudspeakers are mounted on a wall, one h = 3.34 m above the other. Exactly 8.00 meters to the right of the midpoint, a sensor rests at point O. Point O is equally distant from each loudspeaker.   The loudspeakers are driven by the same tone generator and vibrate in phase at 460 Hz. It is possible to create a condition of destructive interference at Point O by changing one or both of the path lengths (r1 and r2) between speaker and sensor. Suppose that this is done by raising the upper speaker while leaving the lower speaker in place. What is the smallest vertical distance (in m) that you would

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.