In Figure A1 in the attachment, the boundary between two ideal dielectrics is shown. Near the boundary, on Er1 side, the electric field is measured and found to be perpendicular to the boundary and equal to 100 V/m.
a) What is the direction of the electric field E, near that boundary and on Er2 side?
b) What is the magnitude of E2, given that Er2 = 5 Er1?
Please see the attachment for the complete question.
Formulas and brief explanations are given wherever relevant.