A) \[2\times {{10}^{-3}}rad\]
B) \[3\times {{10}^{-3}}rad\]
C) \[1.8\times {{10}^{-3}}rad\]
D) \[6\times {{10}^{-3}}rad\]
Correct Answer: A
Solution :
Given, \[\lambda =6000\,\overset{o}{\mathop{A}}\,=6000\times {{10}^{-10}}m\] and \[n=0.3\,\,mm=0.3\times {{10}^{-3}}m\] \[0.3\times {{10}^{-3}}\times \sin \theta =6000\times {{10}^{-10}}\] \[\sin \theta =2\times {{10}^{-3}}\] or \[\theta =2\times {{10}^{-3}}\]rad
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