In interference experiment the path difference between two interfering waves at a point A on the screen is λ / 3, where λ is the wavelength of these…

In interference experiment the path difference between two interfering waves at a point $\displaystyle A$ on the screen is $\displaystyle \lambda / 3$, where $\displaystyle \lambda$ is the wavelength of these waves, and at another point $\displaystyle B$ the path difference is $\displaystyle \lambda / 6$. The ratio of intensities at points $\displaystyle A$ and $\displaystyle B$ is $\displaystyle \_\_\_\_$.