The speed of propagation of light in glass (in a light crown) for red light is 199 * 10 ^ 3 km / s

The speed of propagation of light in glass (in a light crown) for red light is 199 * 10 ^ 3 km / s, for violet – 196 * 10 ^ 3 km / s. Determine the refractive index of glass for red and violet light.

V (cr) = 199 * 10 ^ 3 km / s = 1.99 * 10 ^ 8 m / s.
V (fiol) = 196 * 10 ^ 3 km / s = 1.96 * 10 ^ 8 m / s.
s = 3 * 10 ^ 8 m / s.
n (cr) -?
n (fiol) -?
The absolute refractive index of a medium is determined by the formula: n = c / V, where c is the speed of light in vacuum, V is the speed of light in a given medium.
n (cr) = c / V (cr).
n (fiol) = c / V (fiol).
n (cr) = 3 * 10 ^ 8 m / s / 1.99 * 10 ^ 8 m / s = 1.5.
n (fiol) = 3 * 10 ^ 8 m / s / 1.96 * 10 ^ 8 m / s = 1.53.
Answer: n (cr) = 1.5, n (fiol) = 1.53.