Question

Reflective index of water is 1.33. Find the speed of light

Answer 1

Refractive index = Speed of light in vaccum / Speed of light in water. It is denotes as n = c / v, v = c / n= 3 × 10^8 m/s / (1.33) = 2.25 × 10^8 m/s. Therefore, refractive index of the water can be measure by the Speed of light in water is 2.25 × 10^8 m/s

Answer 2

Speed of light in vacuum S(v) = 3×10^8 m/s

Speed of light in water S(w) = v

Refractive Index = 1.33

=> S(v)/S(w) = 1.33

=> 3×10^8/v = 1.33

=> v = (3×10^8)/1.33

=> v = 2.25×10^8 m/s