A) \[3250\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[6.5\times {{10}^{-4}}\,mm\]
C) 1.24
D) \[2.6\times {{10}^{-4}}\,mm\]
Correct Answer: C
Solution :
For first minima \[\theta =\frac{\lambda }{a}\]or \[a=\frac{\lambda }{\theta }\]\[a=\frac{\lambda }{\theta }\] \[\therefore \] \[a=\frac{6500\times {{10}^{-5}}\times 6}{\pi }\] \[(As\,{{30}^{o}}=\frac{\pi }{6}\,radian)\] \[=1.24\times {{10}^{-4}}\,cm=1.24\,\text{microns}\]
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