# Does electric field lines refract just like light? [closed]

Do electric field lines approaching a boundary at an angle get refracted and change direction just like light rays do?

Because will discussing electric field lines and flux associated with it we do not consider a change in direction

• It's really unclear what you're asking. Commented Apr 24, 2023 at 14:21
• I think the question is: do electric field lines approaching a boundary at an angle get refracted and change direction just like light rays do? It is a good question Commented Apr 24, 2023 at 14:25
• We had similar questions about the conservation of field lines in dielectrics before like physics.stackexchange.com/q/643702. The important thing to understand is that physically the external field causes a polarization of the dielectric, even if the number of field lines (which are a human tool to visualize the field) is unchanged. Commented Apr 24, 2023 at 15:11
• The electric field (and the electric field lines) will generally change across a boundary. The calculation can be performed using these boundary conditions. Commented Apr 24, 2023 at 15:35

If you place a lossless dielectric ellipsoid in an uniform external field $$\mathbf E_0$$ the sum total $$\mathbf E$$ of the internally induced $$\mathbf E_1$$ plus external bias field, $$\mathbf E = \mathbf E_0 +\mathbf E_1$$ and $$\mathbf D = \epsilon \mathbf E$$, will be uniform inside the dielectric whose direction will depend on the direction of $$\mathbf E_0$$ relative to the axes of the ellipsoid.