A light ray traveling through medium 1 with index of refraction (n_{1}=1.70) reaches the interface between medium

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A light ray traveling through medium 1 with index of refraction \(n_{1}=1.70\) reaches the interface between medium 1 and medium 2 with index of refraction \(n_{2}=1.50\).

(a) At what minimum angle with respect to the normal must the ray be incident on the interface in order to be totally internally reflected?

(b) How would the situation change if the ray were traveling in medium 2 when it reached the interface?

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