Multiple Choice
Two coherent sources of monochromatic light are located at S1 and S2 as shown. If the sources are in phase, the intensity at point P is a maximum when
A) d = l.
B) r2 + r1 = l.
C) r2 - r1 = l.
D) r2 + r1 = l/2.
E) r2 - r1 = l/2.
Correct Answer:
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