Question

Why do you determine the refractive indexes of the two pure liquids using the same instrument on the same day?

Answer 1

Because weather changes from one day to another day. This will impact on the temperature of the day. Density of a liquid usually decreases with temperature, hence the speed of light in a liquid will normally increase as the temperature increases. Thus, the index of refraction normally decreases as the temperature increases for a liquid.

This is the only reason for pure liquids, if we take a solution then concentration term also plays an important factor as next day some of the solution will be evaporated or used to be create a partial vapor pressure in the reagent bottle. This will increase concentration, thereby change in refractive index value also.

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