JEE Main 2022 · 26 Jun · Shift 2, Physics question 58

A small bulb is placed at the bottom of a tank containing water to a depth of $\sqrt7$ m. The refractive index of water is $\dfrac43$. The area of the surface of water through which light from the bulb can emerge out is $x\pi$ m$^2$. The value of $x$ is ______.