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I was reading "principles of electomagnetics by sadiku" and there is a diagram concerning reflection of EM waves As given in sadiku

But images on the net enter image description here are different . In the first image the H-field is going into the page in the reflected ray but in the second image they are all coming out of the page . Which is correct?

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Flipping the direction of the vector and changing the sign of its amplitude leaves the vector the same (Essentially, $a \hat x = -a (-\hat x)$).

If you notice, the direction of electric field is flipped too. Both conventions are correct, and the reflection coefficient gets an additional negative sign when comparing the conventions.

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