A) \[1.43{}^\circ \]
B) \[1.56{}^\circ \]
C) \[2.86{}^\circ \]
D) \[30{}^\circ \]
Correct Answer: C
Solution :
For constructive interference, we must have \[2d\,\,\sin \,\,\theta =n\lambda \] or \[\sin \theta =\frac{n\lambda }{2d}=\frac{1\times 0.3\times {{10}^{-10}}}{2\times 0.3\times {{10}^{-9}}}\] \[=0.05\,\,rad\] or \[=\frac{0.05\times 180}{\pi }={{2.86}^{o}}\]
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