Two specks of dirt are trapped in a crystal ball, one at the center and the other
Chapter 31, Problem 59(choose chapter or problem)
Two specks of dirt are trapped in a crystal ball, one at the center and the other halfway to the surface. If you peer into the ball on a line joining the two specks, the outer one appears to be only onethird of the way to the other. Find the refractive index of the ball.
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