Above a slab of dielectric (Region 1) and *inside* the dielectric (Region 2) If we're inside the dielectric in region 2, the point charge is on the *other* side of the surface/boundary, not on our side. We're already "seeing" the point charge as we look across the boundary into Region 1 (no dielectric). There aren't any point charges on our side anymore. Why then do we still need to add an "image" charge in Region 1 (no dielectric area) when figuring out the electric field inside the dielectric?

Above a slab of dielectric (Region 1) and inside the dielectric (Region 2) If we're inside the dielectric in region 2, the point charge is on the other side of the surface/boundary, not on our side. We're already "seeing" the point charge as we look across the boundary into Region 1 (no dielectric). There aren't any point charges on our side anymore. Why then do we still need to add an "image" charge in Region 1 (no dielectric area) when figuring out the electric field inside the dielectric?

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