Determine the speed of light in water if its absolute refractive index is 1.33.

The absolute refractive index of a medium is the ratio of the speed of light in a vacuum (300,000 km / s) to the speed of light in a medium. Using this ratio, we find the speed of light in water:

n = c / v;

v = c / n = 300,000 / 1.33 = 225,564 km / s.

Answer: v = 225564 km / s.

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