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Introduction to YDSE

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Question

Two monochromatic and coherent light source of wavelength $λ = \frac{a}{3}$ 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 $Δ x$ at B is $Δ x = 2 a$ or $Δ x = 6 λ$
and that at A is $Δ x = 0$ .
Hence there are 7 maxima's in total.

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