Question

The speed of light in water is 2.25 x 108 m/s. What is true about the index of refraction of water? A. It is less than 1. B. It is more than 1. C. It is 0. D. It is equal to 1.

Answer 1

The answer is letter B. more then one. hope this helps!

Answer 2

Good afternoon!


We can see that $\mathsf{2.25\times10^8\ \textless \ 3\times10^8 = c}$

The index of refraction can be calculated as:

$\mathsf{n = \dfrac{c}{v}}$

As we noted, $\mathsf{v \ \textless \ c}$ , and therefore:

$\mathsf{\dfrac{v}{v} \ \textless \ \dfrac{c}{v}}\\ \\ \\ \mathsf{\dfrac{c}{v} \ \textgreater \ 1}$

Beccause n = c/v, we have:

n > 1

B - Is more than 1.