# 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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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

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