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Two coherent sources separated by distan...

Two coherent sources separated by distance d are radiating in phase having wavelength `lambda`. A detector moves in a big circle around the two sources in the plane of the two sources. The angular position of `n=4` interference maxima is given as

A

`"sin"^(-1)(n lambda)/(d)`

B

`"cos"^(-1)(4 lambda)/(d)`

C

`"tan"^(-1) (d)/(4 lambda)`

D

`"cos"^(-1) (lambda)/(4d)`

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