Coherent waves are produced at P and at Q and travel outwards in all directions. The line RS is half-way between P and Q and perpendicular to the line joining P and Q. The distance RS is much greater than the distance PQ.
Along which of the lines shown is an interference pattern observed?
1 )
both RS and XY
2 )
RS only
XY only
4 )
neither RS nor XY
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