本题目来源于试卷: Light: Geometric Optics，类别为 IB物理学
[问答题]
The end faces of a ccoik ,* ra*:gb *ge;+gmnhfe fj0( w6eylindr5qavy6 sa u2)aical glass rod $(n=1.54)$ are perpendicular to the sides. Show that a light ray entering an end face at any angle will be totally internally reflected inside the rod when the ray strikes the sides. Assume the rod is in air. What if it were in water?
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