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

• A
  $I=\sqrt{A^2+B^2 \cos ^2 \emptyset}$
• B
  $I=\frac{A}{B} \cos \varnothing$
• C
  $I=A+B \cos ^{\frac{\emptyset}{2}}$
• ✓
  $I =\mathrm{A}+\mathrm{B} \operatorname{Cos} \varnothing$