Three waves of equal frequency having amplitudes 10 µm, 4 µm and 7 µm arrive at a given point with a successive phase difference of π π /2. The amplitude of the resulting wave is µm in given by
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The amplitudes of the waves are
and the phase difference between 1st and 2 nd wave is
and that between 2 nd and 3 rd wave is 
.
Therefore, phase difference between 1st and 3rd is 
. Combining 1st with 3rd, their resultant amplitude is given by
or 
in the direction of first.
Now combining this with 2 nd wave we have, the resultant amplitude
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