Two coherent sources separated by distance d are radiating in phase having wavelength λ. 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
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a
sin−1nλd
b
cos−14λd
c
tan−1d4λ
d
cos−1λ4d
answer is B.
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Detailed Solution
Here path difference at a point P on the circle is given byΔx=dcosθ …..(i)For maxima at PΔx=nλ …..(ii)From equations (i) and (ii)nλ=dcosθ⇒θ=cos−1nλd=cos−14λd