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The z equals 0 plane forms the boundary between media 1 and media 2 with parameters (epsilon sub 1, micro sub 1) and (epsilon sub 2, micro sub 2). The two lines with direction vector k sub i represent rays along the wavefront of incident wave. The two lines with direction vector k sub r represent rays along the wavefront of reflected wave. The two lines with direction vector k sub t represent rays along the wavefront of transmitted wave. The angle of incidence is theta sub 1, angle of reflection is theta sub r and angle of transmission is theta sub t. The incident and reflected waves propagate in medium 1 and transmitted wave propagate in medium 2.