A) I / 2
B) I
C) 2I
D) 4I
Correct Answer: D
Solution :
For maximum intensity \[\varphi =0{}^\circ \] \ \[I={{I}_{1}}+{{I}_{2}}+2\sqrt{{{I}_{1}}{{I}_{2}}}\cos \varphi \]\[=I+I+2\sqrt{I\,I}\cos 0{}^\circ =4I\]
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