Sketch a sinusoidal wave with an amplitude of 3 V/m and a wavelength of 600 nm. This represents the electric field portion of a visible EM wave traveling to the right with intensity I0. Beneath the first wave, sketch another that is identical to the first in wavelength, but with an amplitude of 2 V/m and 180° out of phase. Beneath the second wave, sketch a third wave of the same wavelength with an amplitude of 0.5 V/m and in phase with the first wave. The three waves are coherent. What is the intensity of light when the three waves are added?
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