A light wave travels through three transparent materials of equal thickness. Rank in order, from the highest to lowest, the indices of refraction $n_1, n_2$ and $n_3$.
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${\lambda ^i} = \frac{\lambda }{n}$
${\lambda _2} > {\lambda _1} < {\lambda _3}$
${n_2} < {n_1} < {n_3}$
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