1) phase difference = (2pi / ) * path difference
so phase difference = (2pi/900*10^-9 ) * 10*10^-6
= 69.8 rad
2) pi = 2pi / * 1.2*10^-6
= 2.4 um
so wavelength is 2.4 um
2. Path difference between two points on an EM wave is 10pm. If the wavelength A=900...
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