A) sin-1(l/d)
B) sin-1(l/2d)
C) sin-1(l/3d)
D) sin-1(l/4d)
Correct Answer: C
Solution :
\[I=4{{I}_{0}}\] cos2(f/2) Þ f = 2p/3 Þ Dx ´ (2p/l) = 2p/3= l/3 sin q = Dx/d Þ sin q = l/3d
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