Light traveling in water (n=1.33) moves with what speed? (a) 1.5 x 10^8 m/s (b) 2.26 x 10^8 m/s (c) 3 x 10^8 m/s (d) 3.99 x 10^8 m/s

b) 2.26*10^8 m/s

Explanation:

let n be the refractive index, v be the speed of light in water.

then, the refractive index is given by:

n = c/v

v = c/n

= (3*10^8) / (1.33)

= 2.26*10^8 m/s

Therefore, the speed of light in water is moving with a speed of 2.26*10^8 m/s.