Answer :
refractive index = [tex]\frac{speed of light}{ phase \ velocity \ of \ light}[/tex]
n= [tex]\frac{C}{V}[/tex]
V= 70% of C
V = [tex]\frac{70}{100}[/tex] [tex]\times[/tex]C
V = 0.7C
n = [tex]\frac{C}{0.7C}[/tex]
n = [tex]\frac{10}{7}[/tex]
n = 1.428
n = 1.43
what is a refractive index?
Refractive index is additionally referred to as the refraction index or index of refraction. The speed of light in a medium depends on the properties of the medium. In electromagnetic waves, the speed is dependent on the optical density of the medium. Optical density is the tendency of the iotas in material to restore the ingested electromagnetic energy. The more optically dense material is, the slower the speed of light. One such indicator of the optical density of a medium is the refractive index.
To learn more about the Refractive index, visit;
https://brainly.com/question/12469161
#SPJ4
