Answer to Question #116467 in Electric Circuits for sam

Question

If a refractive index of wateris 4/3 and the angle of incidence is 30. Find the speed of light in water

Answer 1

Solution. From the definition of the refractive index

$$n=\frac{c}{v}$$

where c=3x10^8 m/s is  speed of light in vacuum, v is speed of light in material (water).

Therefore get

$$v=\frac{c}{n}=\frac{3\times 10^9}{\frac{4}{3}}=2.25\times 10^9\frac{m}{s}$$

Answer.

$$v=2.25\times 10^9\frac{m}{s}$$