a.If the speed of light in a medium is 1.5 × 10^8 m/s,what is the absolute refractive index of the medium?
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absolute refractive index= speed of light in air / speed of light in the medium.
=> abs RI = 3*10^8/1.5*10^8
=> RI = 20m/s
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your answer is is 2
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