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Refraction and speed of light (2759)
Miércoles 22 de octubre de 2014, por
The refractive index of green light in water is 1.42. What is its speed when it travels through water?
(Velocity of light in a vacuum is 300 000 km/s).
The formula for calculating the refractive index is:
![\color[RGB]{2,112,20}{\bm{n = \frac{c}{v}}}](local/cache-vignettes/L63xH44/9393c9bdce5c7e01f166d3f9fe43976d-db580.png?1733060771 "\color[RGB]{2,112,20}{\bm{n = \frac{c}{v}}}"){kind=small}
Solving the equation to determine the speed of light:
![{\color[RGB]{2,112,20}{\bm{v = \frac{c}{n}}}} = \frac{300\ 000\ \frac{km}{s}}{1.42} = \fbox{\color[RGB]{192,0,0}{\bm{211\ 268\ \frac{km}{s}}}}](local/cache-vignettes/L358xH51/94fb96afd2b467fe7d92b8bb49bdebbd-7799f.png?1733060771 "{\color[RGB]{2,112,20}{\bm{v = \frac{c}{n}}}} = \frac{300\ 000\ \frac{km}{s}}{1.42} = \fbox{\color[RGB]{192,0,0}{\bm{211\ 268\ \frac{km}{s}}}}")