Two identical coherent sources are placed on a diameter of a circle of radius R at a separation `d(ltltR)(d=nlambda)` symmetrica

Two identical coherent sources are placed on a diameter of a circle of radius R at a separation `d(ltltR)(d=nlambda)` symmetrically about the centre of the circle. The sources emit identical wavelength `lambda` each. What will be the number of points on the circle with constructive interference?
A. 20
B. 22
C. 24
D. 26

Two identical coherent sources are placed on a diameter of a circle of radius R at a separation `d(ltltR)(d=nlambda)` symmetrically about the centre o

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