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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 expression

• A
  $I = \sqrt {{A^2} + {B^2}{{\cos }^2}\phi } $
• B
  $I = \frac{A}{B}\cos \phi $
• C
  $I = A + B\cos \frac{\phi }{2}$
• ✓
  $I = A + B\cos \phi $Where $A $ and $B $ depend upon the amplitudes of the two waves.