With the previous problem in mind, return to Eq. (4.19) and take the origin of the coordinate system in the plane-of-incidence and on the interface (Fig. 4.47). Show that that equation is then equivalent to equating the x- components of the various propagation vectors. Show that it is also equivalent to the notion of wavefront continuity.

Fig 4.47

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(61't) 9=¶'3 +!• ) = 9 = <|('3 + L • ") = 9=¶1.) Bị kị (a) k, Interface п, п (b) B; cos 0 Interface