Physics - Wave Optics Question with Solution | TestHub

$\mathrm{A}$ and $\mathrm{B}$ are two interfering sources where $\mathrm{A}$ is ahead in phase by $54^{\circ }$ relative to $B$. The observation is taken from point $\mathrm{P}$ such that $\mathrm{PB}-\mathrm{PA}=2.5\lambda$. Then the phase difference between the waves from $A$ and $B$ reaching point $\mathrm{P}$ is (in rad)