Solving a problem in physics section 31 paragraph 90 el

90. In the space of half-filled with paraffin (ε2 = 2) created a uniform electrostatic field whose strength in vacuum E1 = 4 V / m. Vector E, forms a plane boundary vacuum - paraffin angle α = 60 °. Determine in paraffin: 1) the electric displacement D2; 2) the intensity E2 of the electrostatic field; 3) polarization P2.