A) \[60{}^\circ \]
B) \[30{}^\circ \]
C) \[90{}^\circ \]
D) \[0{}^\circ \]
Correct Answer: B
Solution :
[b] \[\theta ={{\sin }^{-1}}\left( \frac{\lambda }{a} \right)\] ...(1) According to question \[\lambda =2\times {{10}^{-3}}m\] \[a=4\times {{10}^{-3}}m\] .....(2) From equation (1) and (2) \[\theta ={{\sin }^{-1}}\left( \frac{1}{2} \right)\] \[\theta =30{}^\circ ,\]Hence correct answer is (2).
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