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In the figure below, PQRS denotes the path followed by a ray of light as it travels through three media in succession. The absolute refractive indices of the media are $\mu_{1}, \mu_{2}$ and $\mu_{3}$ respectively. (The line segment $\mathrm{RS}$ ' in the figure is parallel to $\mathrm{PQ}$ ).
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The correct answer is:
$\mu_{1} < \mu_{3} < \mu_{2}$
$\mu_{1} < \mu_{3} < \mu_{2}$
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