A) \[0.8{}^\circ \]
B) \[0.64{}^\circ \]
C) \[1.2{}^\circ ~\]
D) \[2.2{}^\circ \]
Correct Answer: C
Solution :
[c] \[\lambda =\frac{c}{f}=\frac{3\times {{10}^{8}}}{1420\times {{10}^{6}}}=0.214m\] \[\sin \theta =\frac{1.22\lambda }{d}=\frac{1.22\times 0.219}{25}=0.010\] or \[\theta ={{0.6}^{o}}\], and \[2\theta ={{1.2}^{o}}\]
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