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In the Young's double slit experiment, if the phase difference between the two waves interfering at a point is $\phi$, the intensity at that point can be expressed by the expressionWhere $A$ and $B$ depend upon the amplitudes of the two waves.

• A
  (a) $I=\sqrt{A^2+B^2 \cos ^2 \phi}$
• B
  (b) $I=\frac{A}{B} \cos \phi$
• C
  (c) $I=A+B \cos \frac{\phi}{2}$
• ✓
  (d) $I=A+B \cos \phi$