80. The end faces of a cylindrical glass rod (/i = 1.54)
Chapter 23, Problem 80(choose chapter or problem)
80. The end faces of a cylindrical glass rod (/i = 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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