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Two coherent point sources of frequency ( $f = \frac{10 v}{d}$ where v is speed of light in air) are placed at a distance d apart as shown in figure. The receiver is free to move along the dotted line shown in the figure. The total number of maxima observed by receiver is

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detailed solution

Correct option is C

λ=d10, path difference =nλ=nd/10 Maximum path difference =2d3-d3=d3. Therefore nd10≤d3 ∴ |n=±1,±2,±3| ∴|n|=6

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