Two dielectric media with dielectric constants ϵ1 and ϵ2 are separated by a plane interface. There is no free charge on the interface. Find a relationship between the angles θ1 and θ2, where these are the angles which an arbitrary line of displacement make with the normal to the interface: θ1 in medium 1, θ2 in medium 2.

Two dielectric media with dielectric constants ϵ1 and ϵ2 are separated by a plane interface. There is no free charge on the interface. Find a relationship between the angles θ1 and θ2, where these are the angles which an arbitrary line of displacement make with the normal to the interface: θ1 in medium 1, θ2 in medium 2.

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