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