Index Refraction Yell Light Sodium Lamp Liquid 1.92E8m/s

[skinnermitch]

The Speed of yellow light( from a sodium lamp) in a certain liquid is measured to be 1.92E8 m/s. What is the index of refraction of this liquid for the light?

 

[SuperSonic4]

The Speed of yellow light( from a sodium lamp) in a certain liquid is measured to be 1.92E8 m/s. What is the index of refraction of this liquid for the light?

The refractive index for a given medium is given by $$n = \dfrac{c}{v_n}$$Where $$n$$ is the refractive index, $$c$$ is the speed of light in a vacuum defined as ($$299,792,458 \text{ m/s} \approx 3 \times 10^8 \text{ m/s}$$) and $$v_n$$ is the speed of light in the medium in m/s

In your case $$c = 299792458 \text{ m/s}$$ and $$v_n = 1.92 \times 10^8 \text{ m/s}$$

nb: Some books don't mind you using 3E8, others do.