Question

Light travels through a vacuum at a speed of 3 x 10 m/s. What is the speed of

light in water if the index of refraction is 1.333?

Answer 1

v = c / n (n = 1 for air)

v = c / 1.33 = 3 * 10E8 m/s / 1.33 = 2.25 * 10E8 m/s