A) \[4.5\times {{10}^{-3}}\]rad
B) \[9.0\times {{10}^{-3}}\]rad
C) \[2.25\times {{10}^{-3}}\]rad
D) None of these
Correct Answer: A
Solution :
Mostly, diffraction takes place between two first order minima. In case of minima, \[b\sin \theta =\pm \lambda \]\[\Rightarrow \]\[b\sin \theta =\pm \frac{900\times {{10}^{-9}}m}{0.4\times {{10}^{-3}}m}\] \[=\pm 2.25\times {{10}^{-3}}\]\[\Rightarrow \]\[\theta \approx 2.25\times {{10}^{-3}}rad.\] Therefore, the angular divergence. \[=4.5\times {{10}^{-3}}\]rad
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