If the index of refraction of glass is 1.8 and the speed of light in air is 3.00 · 108 m/s, what is the speed of light in that glass? (Round answer to nearest hundredth.)
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Answer: Refractive index =c/speed of light in any medium,v
c-speed of light in vacuum or air
Explanation: Answer is 1.6*10^8m/s
Rounding of to the nearest 100 gives the answer as 2*10^8 m/s
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