All Problems Interference of Light
Problem 5.65
By means of plotting find the amplitude of the oscillation resulting from the addition of the following three oscillations of the same direction: \[ \xi_{1}=a \cos \omega t, \quad \xi_{2}=2 a \sin \omega t, \quad \xi_{3}=1.5 a \cos (\omega t+\pi / 3) \]