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Question

Two monochromatic and coherent light source of wavelength λ=a3 are placed on x-axis at (-a, 0) and (a, 0). Then number of maxima between one quarter AB are. [Include at A and B if any]

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Solution

Path difference Δx at B is Δx=2a or Δx=6λ
and that at A is Δx=0.
Hence there are 7 maxima's in total.

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