An electromagnetic wave is represented by the electric field $\overrightarrow{\mathbf{E}}=\mathrm{E}_0 \hat{n} \sin [\omega t+(6 y-8 z)]$. Taking unit vectors in $x, y$ and $z$ directions to be $\hat{\mathrm{i}}, \hat{\mathrm{j}}, \hat{\mathrm{k}}$, the direction of propogation $\hat{\mathbf{s}}$, is :