Light passes from air to water. What is the speed of light in the second medium v
| May 16, 2021 | education
Light passes from air to water. What is the speed of light in the second medium v, if the speed of light in vacuum is equal to c = 300000 km / s, and the refractive index of the second medium is 1.33?
Given:
c = 300,000 km / s is the speed of light in vacuum;
n = 1.33 is the refractive index of the medium (water).
It is required to determine the speed of light in water v (km / s).
Since the condition of the problem is not specified, we assume that the speed of light in air is equal to the speed of light in vacuum. Then:
n = c / v, hence:
v = c / n = 300,000 / 1.33 = 225,564 km / s.
Answer: the speed of light in the second medium (water) is 225564 km / s.
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