Two monochromatic and coherent point sources of light are placed at a certain distance from each...

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Two monochromatic and coherent point sources of light are placed at a certain distance from each other in the horizontal plane. The locus of all those points in the horizontal plane which have constructive interference will be
a. A hyperbola
b. Family of hyperbolas
c. Family of straight lines
d. Family of parabolas
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