A small air bubble is 4.2 cm below the surface of a clear piece of plastic. When an opaque disk with a 3.4 cm radius is placed directly over the bubble, the bubble cannot be seen from above from any angle. What does this imply about the index of refraction of the plastic?
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A small air bubble is 4.2 cm below the surface of a clear piece of plastic. When an opaque disk with a 3.4 cm radius is placed directly over the bubble, the bubble cannot be seen from above from any angle. What does this imply about the index of refraction of the plastic?
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