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Absolute and Relative Refractive Index

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Question

the refractive indices of acohol and turpentine oil with respect to air are 1.36 and 1.47 respectively. Find the refractive index of turpentine oil with respect to acohol.Which one of these will permit the light to travel faster

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Solution

refractive index of turpentine oil with respect to alcohol
= (refractive index of turpentine oil)/(refractive index of alcohol)
=1.47/1.36 = 1.08
Since refractive index of alcohol is less than refractive index of turpentine oil so, light will travel faster in the alcohol.

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