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Two monochromatic (wavelength =a//5) and...

Two monochromatic (wavelength `=a//5`) and coherent sources of electromagnetic waves are placed on the x-axis at the point (2a,0) and `(-a,0)`. A detector moves in a circle of radius `R(gt gt 2a)` whose centre is at te origin. The number of maximas detected during one circular revolution by the deterctor are -

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