Physics
posted by Andrea .
Find the speed of light in flint glass if the index of refraction is n=1.66. How much slower in percent of speed of light in a vacuum c does the light move in each of this medium?
v=c/n
v=3x10^8m/s/1.66
=1.8x10^8m/s
For the percent of speed of light in a vacuum c. Would it be: 3x10^81.8x10^8/3x10^8 *100 = 40%
Is this correct? I'm not to sure about the percent part though.

right on v.
Percent= (speedlightnewspeed)/speedlight * 100