Question: Problem 4.36 At the interface between one linear dielectric and another, the electric field lines bend (see Fig. 4.34). Show that tan 6/ tan 01

 Problem 4.36 At the interface between one linear dielectric and another,the electric field lines bend (see Fig. 4.34). Show that tan 6/
tan 01 = 61/61, (4.68) assuming there is no free charge atthe boundary. [Comment: Eq. 4.68 is reminiscent of Snell's law in optics.

Problem 4.36 At the interface between one linear dielectric and another, the electric field lines bend (see Fig. 4.34). Show that tan 6/ tan 01 = 61/61, (4.68) assuming there is no free charge at the boundary. [Comment: Eq. 4.68 is reminiscent of Snell's law in optics. Would a convex "lens" of dielectric material tend to "focus," or "defocus," the electric field?]

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