If the intensity of each wave in the observed interference pattern in Young's double slit experiment is $I_0$,then for some point $P$ where the phase difference is $\phi$,the resultant intensity $I$ will be:
- A$I = I_0 \cos \phi$
- B$I = I_0 \cos^2 \phi$
- C$I = I_0 (1 + \cos \phi)$
- D$I = 2I_0 (1 + \cos \phi)$
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