Physics Question:

How is the index of refraction computed:

Answer:

1. the speed of light in a vacuum is divided by the speed of light in the material
2. the speed of light in the material is divided by the speed of light in a vacuum
3. the speed of light in water is divided by the speed of light in a vacuum
4. the speed of light in a vacuum is divided by the speed of light in water

Answer: A

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According to the standard model of particle physics, which of the following is a force-carrying particle:	ASTRONOMY Multiple Choice A parsec is equal to which of the following: