The Diagram Shows a Single Slit with the Direction to a Point

The diagram shows a single slit with the direction to a point P on a distant screen (not shown) . At P, the pattern has its second minimum (from its central maximum) . If X and Y are the edges of the slit, what is the path length difference (PX) - (PY) ?

A) $\lambda$ /2
B) $\lambda$
C) 3 $\lambda$ /2
D) 2 $\lambda$
E) 5 $\lambda$ /2

Correct Answer:

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