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m Task 18 (cosmetic): eval 5 templates: del empty params (2×); |
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|year=1994
|publisher=Courier Dover
|isbn= 9780486680446
|url=https://books.google.com/books?id=naUSNojPwOgC
}}</ref> for the ray vectors can be employed. Instead of using θ≈sin θ, the second element of the ray vector is ''n'' sin θ, which is proportional not to the ray angle ''per se'' but to the transverse component of the [[wave vector]].
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