Example situation
If I knew that this green light, which has a wavelength of 500 nm in air, travels through a medium with a refractive index of 2.4, how would I find the wavelength in the medium?
These are the formulas that I do know:
$$\lambda_0=\frac{1}{f}V_0$$
$$ c=\lambda f $$
$$ n=\frac{c}{v} $$
But I do not understand how all of these equations would play out in finding out the wavelength?