Two identica light waves, A and B, are emitted coherently from different sources

Question

Two identica light waves, A and B, are emitted coherently from different sources and meet at point P. The distance from the source of A to the point P is rA; and the source of B is a distance rB from P. which of the following statements is necessarily true concerning the interference of the two waves?

a. A and B will interfere destructively if rA is not equal to rB

b. A and B will interfere constructively bc their wavelengths are the same

c. A and B will interfere constructively bc their amplitudes are the same

d. A and B will interfere constructively if rA-rB=n (lembda) where n=0,1,2...

e. A and B will interfere constructively only when rA=rB

Explanation / Answer

d. A and B will interfere constructively if rA-rB=n (lembda) where n=0,1,2...

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