Homework Help: physics

Posted by Jenna on Monday, October 24, 2011 at 6:42pm.

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?

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