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physics

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we know that the speed of light in a vacuum is 3.0 x 10^8 m/s (18,000 mi/sec). If light travels through thick plastic with a speed of 1.75 x 10^8 m/s, what is the index of refraction through plastic?

  • physics -

    index of refraction= speed of light in space/speed of light in material=3.0/1.75=

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