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The refractive indices of alcohol and turpentine oil with respect to air are 1.36 and 1.47 respectively. Find the refractive index of turpentine

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The refractive indices of alcohol and turpentine oil with respect to air are 1.36 and 1.47 respectively. Find the refractive index of turpentine oil with respect to alcohol. Which one of these permits the light to travel faster?

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1. The refractive index of turpentine oil with respect to alcohol = 1.47/ 1.36 = 1.08.

2. The refractive index increases when the speed of light decreases. So light travels faster in alcohol as its refractive index is less.

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