Electric field intensity inside mixed dielectric capacitor

I have a capacitor with stacked dielectrics where $d_1 =10^{-3} \ m$ , $\varepsilon_{1} = 7$ and $d_2 =0.5 \cdot 10^{-3} \ m$ , $\varepsilon_{2} = 2$ and $V = 500V$ . How would I go about calculating the electric field intensity in each dielectric? I know that I can treat the capacitor as 2 capacitors connected in series. I can get $E = Vd$ and $V = E_1d_1 + E_2d_2$ but I don't know how to get the actual values of $E_1$ and $E_2$ .