Question

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

Answer 1

b) 2.26×10^8 m/s

Step-by-step 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.