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Light suffers total internal reflection at a glass-vacuum interface. Assuming that the electric field is perpendicular...

Light suffers total internal reflection at a glass-vacuum interface. Assuming that the electric field is perpendicular to the plane of incidence, calculate the time-average Poynting vector in the vacuum region just outside the glass. Show that this vector is parallel to the interface.

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From Snells law, 0.-sin-| | | Ί | sin θ, | ( t corresponds to transmission and corresponds to incidence) At critical incidenThe wave vector is given by, The Poynting vector is, 2η The Time-averaged Poynting vector is, Real cos θ Realsine,

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