In a Young's double slit experiment, the separation between the two slits is d and the wavelength of the light is $\lambda$. The intensity of light falling on slit $1$ is four times the intensity of light falling on slit $2$. Choose the correct choice (s).

In an interference arrangement similar to Young's double slit experiment, the slit $S_1$ and $S_2$ are illuminated with coherent microwave sources, each of frequency ${10}^6 \mathrm{Hz}$. The sources are synchronised to have zero phase-difference. The slits are separated by a distance $d=150.0 \mathrm{m}.$ The intensity $I\left(\theta \right)$ is measured as a function of $\theta$, where $\theta$ is shown . If $I_0$ is the maximum intensity, then $I\left(\theta \right)$ for $0<\theta <90°$ is given by