Question

A light wave of wavelength 600 nm passes from air into a medium with refractive index 1.5. What is the wavelength of light in the medium?

• A. 400 nm
• B. 450 nm
• C. 500 nm
• D. 600 nm

Hint:

Wavelength of light in a medium = $\lambda/n$, where $\lambda$ is original wavelength and $n$ is the refractive index.